From 4d760c31c8e3672b8488247ab62af3a45136fa40 Mon Sep 17 00:00:00 2001
From: Luca Foppiano <luca@foppiano.org>
Date: Sat, 18 May 2024 08:23:02 +0900
Subject: [PATCH 01/10] cleanup

---
 streamlit_pdf_viewer/frontend/src/PdfViewer.vue | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
index 516d6b9..f4fe3fe 100644
--- a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
+++ b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
@@ -98,8 +98,6 @@ export default {
     const createCanvasForPage = (page, scale, rotation, pageNumber) => {
       const viewport = page.getViewport({scale, rotation});
 
-      // console.log(`Page viewport size: ${viewport.width}, ${viewport.height}`)
-
       const ratio = window.devicePixelRatio || 1
 
       const canvas = document.createElement("canvas");
@@ -216,7 +214,6 @@ export default {
     });
 
     onUpdated(() => {
-      // console.log("onUpdated")
       setFrameHeight();
     });
 

From edfd69f0d66226a190e47898eba17c33978b69ce Mon Sep 17 00:00:00 2001
From: Luca Foppiano <luca@foppiano.org>
Date: Sat, 18 May 2024 08:23:10 +0900
Subject: [PATCH 02/10] update pdf.js

---
 streamlit_pdf_viewer/frontend/package.json | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/streamlit_pdf_viewer/frontend/package.json b/streamlit_pdf_viewer/frontend/package.json
index 94724c8..51faa2d 100644
--- a/streamlit_pdf_viewer/frontend/package.json
+++ b/streamlit_pdf_viewer/frontend/package.json
@@ -8,8 +8,8 @@
   },
   "dependencies": {
     "core-js": "^3.6.5",
-    "pdfjs-dist": "^3.6.172",
-    "streamlit-component-lib": "^1.1.1",
+    "pdfjs-dist": "^3.11.174",
+    "streamlit-component-lib": "^2.0.0",
     "vue": "^3.0.0-0"
   },
   "devDependencies": {

From f1fc3492319c77d7e8cef6136ecc0d6eac06dcff Mon Sep 17 00:00:00 2001
From: Luca Foppiano <luca@foppiano.org>
Date: Sat, 18 May 2024 08:23:15 +0900
Subject: [PATCH 03/10] add CMAP

---
 streamlit_pdf_viewer/frontend/src/PdfViewer.vue | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
index f4fe3fe..ed27c0c 100644
--- a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
+++ b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
@@ -28,6 +28,10 @@ import "pdfjs-dist/build/pdf.worker.entry";
 import {getDocument} from "pdfjs-dist/build/pdf";
 import {Streamlit} from "streamlit-component-lib";
 
+const CMAP_URL = "pdfjs-dist/cmaps/";
+const CMAP_PACKED = true;
+const ENABLE_XFA = true;
+
 export default {
   props: ["args"],
 
@@ -170,7 +174,12 @@ export default {
 
     const loadPdfs = async (url) => {
       try {
-        const loadingTask = await getDocument(url);
+        const loadingTask = await getDocument({
+          "url": url,
+          "cMapUrl": CMAP_URL,
+          "cMapPacked": CMAP_PACKED,
+          "enableXfa": ENABLE_XFA,
+        });
         const pdfViewer = document.getElementById("pdfViewer");
         clearExistingCanvases(pdfViewer);
 

From 0c02288e0d73b0c7c395ca0595399a8430ef1705 Mon Sep 17 00:00:00 2001
From: Luca Foppiano <luca@foppiano.org>
Date: Sat, 18 May 2024 08:40:58 +0900
Subject: [PATCH 04/10] add textlayers

---
 .../frontend/src/PdfViewer.vue                | 36 +++++++++++++++----
 1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
index ed27c0c..6ca4cc9 100644
--- a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
+++ b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
@@ -24,9 +24,11 @@
 
 <script>
 import { onMounted, onUpdated, computed, ref} from "vue";
+import "pdfjs-dist/web/pdf_viewer.css";
 import "pdfjs-dist/build/pdf.worker.entry";
 import {getDocument} from "pdfjs-dist/build/pdf";
 import {Streamlit} from "streamlit-component-lib";
+import * as pdfjsLib from "pdfjs-dist";
 
 const CMAP_URL = "pdfjs-dist/cmaps/";
 const CMAP_PACKED = true;
@@ -117,18 +119,32 @@ export default {
     };
 
 
-    const renderPage = async (page, canvas) => {
+    const renderPage = async (page, canvas, viewport) => {
       const renderContext = {
         canvasContext: canvas.getContext("2d"),
-        viewport: page.getViewport({
-          scale: pageScales.value[page._pageIndex],
-          rotation: page.rotate,
-          intent: "print",
-        })
+        viewport: viewport
       };
 
       const renderTask = page.render(renderContext);
       await renderTask.promise;
+
+      const textContent = await page.getTextContent();
+      const textLayerDiv = document.createElement("div");
+      textLayerDiv.className = "textLayer"
+      textLayerDiv.style.position = "absolute";
+      textLayerDiv.style.height = `${viewport.height}px`;
+      textLayerDiv.style.width = `${viewport.width}px`;
+      pdfjsLib.renderTextLayer({
+        textContentSource: textContent,
+        container: textLayerDiv,
+        viewport: viewport,
+        textDivs: []
+      })
+
+      const pdfViewer = document.getElementById("pdfViewer");
+      pdfViewer.appendChild(textLayerDiv)
+
+
     };
 
     const renderPdfPages = async (pdf, pdfViewer, pagesToRender = null) => {
@@ -156,9 +172,15 @@ export default {
           const canvas = createCanvasForPage(page, scale, rotation, pageNumber)
           pdfViewer?.append(canvas)
 
+          const viewport = page.getViewport({
+            scale: pageScales.value[page._pageIndex],
+            rotation: page.rotate,
+            intent: "print",
+          });
+
           const ratio = window.devicePixelRatio || 1
           totalHeight.value += canvas.height / ratio
-          await renderPage(page, canvas)
+          await renderPage(page, canvas, viewport)
         }
       }
       // Subtract the margin for the last page as it's not needed

From 3798b433271d872f23dd7683d3fc0a7c91ae76b1 Mon Sep 17 00:00:00 2001
From: Luca Foppiano <luca@foppiano.org>
Date: Sat, 18 May 2024 08:45:47 +0900
Subject: [PATCH 05/10] improvement

---
 streamlit_pdf_viewer/frontend/src/PdfViewer.vue | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
index 6ca4cc9..badb71b 100644
--- a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
+++ b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
@@ -49,10 +49,9 @@ export default {
       if (isRenderingAllPages) {
         return props.args.annotations;
       }
-      const filteredAnnotations = props.args.annotations.filter(anno => {
+      return props.args.annotations.filter(anno => {
         return props.args.pages_to_render.includes(Number(anno.page))
       })
-      return filteredAnnotations;
     });
 
     const pdfContainerStyle = computed(() => ({

From 5f09846fbc5b4cd71ab910f98b343d681e5808ed Mon Sep 17 00:00:00 2001
From: t29mato <tomoya.matou@gmail.com>
Date: Wed, 22 May 2024 11:31:42 +0900
Subject: [PATCH 06/10] Updated webpack configuration (vue.config.js) to handle
 increased ES6+ syntax usage after upgrading PDFJS from version 3 to 4. Also,
 updated transpilation libraries to the latest versions to avoid errors with
 old libraries.

---
 streamlit_pdf_viewer/frontend/package.json    | 25 ++++++++-----------
 .../frontend/src/PdfViewer.vue                |  2 +-
 streamlit_pdf_viewer/frontend/vue.config.js   | 12 ++++++---
 3 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/streamlit_pdf_viewer/frontend/package.json b/streamlit_pdf_viewer/frontend/package.json
index 51faa2d..8acd22b 100644
--- a/streamlit_pdf_viewer/frontend/package.json
+++ b/streamlit_pdf_viewer/frontend/package.json
@@ -8,24 +8,21 @@
   },
   "dependencies": {
     "core-js": "^3.6.5",
-    "pdfjs-dist": "^3.11.174",
+    "pdfjs-dist": "^4.2.67",
     "streamlit-component-lib": "^2.0.0",
     "vue": "^3.0.0-0"
   },
   "devDependencies": {
-    "@babel/plugin-proposal-class-properties": "^7.18.6",
-    "@babel/plugin-proposal-private-methods": "^7.18.6",
-    "@typescript-eslint/eslint-plugin": "^2.33.0",
-    "@typescript-eslint/parser": "^2.33.0",
-    "@vue/cli-plugin-babel": "~4.5.0",
-    "@vue/cli-plugin-eslint": "~4.5.0",
-    "@vue/cli-plugin-typescript": "^4.5.0",
-    "@vue/cli-service": "~4.5.0",
-    "@vue/compiler-sfc": "^3.0.0-0",
-    "@vue/eslint-config-typescript": "^5.0.2",
+    "@typescript-eslint/eslint-plugin": "^7.10.0",
+    "@typescript-eslint/parser": "^7.10.0",
+    "@vue/cli-plugin-babel": "^5.0.8",
+    "@vue/cli-plugin-typescript": "^5.0.8",
+    "@vue/cli-service": "^5.0.8",
+    "@vue/compiler-sfc": "^3.4.27",
+    "@vue/eslint-config-typescript": "^13.0.0",
     "babel-eslint": "^10.1.0",
-    "eslint": "^6.7.2",
-    "eslint-plugin-vue": "^7.0.0-0",
-    "typescript": "4"
+    "typescript": "^5.4.5",
+    "vue-loader": "^17.4.2",
+    "webpack": "^5.91.0"
   }
 }
diff --git a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
index badb71b..5054908 100644
--- a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
+++ b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
@@ -25,7 +25,7 @@
 <script>
 import { onMounted, onUpdated, computed, ref} from "vue";
 import "pdfjs-dist/web/pdf_viewer.css";
-import "pdfjs-dist/build/pdf.worker.entry";
+import "pdfjs-dist/build/pdf.worker.mjs";
 import {getDocument} from "pdfjs-dist/build/pdf";
 import {Streamlit} from "streamlit-component-lib";
 import * as pdfjsLib from "pdfjs-dist";
diff --git a/streamlit_pdf_viewer/frontend/vue.config.js b/streamlit_pdf_viewer/frontend/vue.config.js
index 283d953..8127624 100644
--- a/streamlit_pdf_viewer/frontend/vue.config.js
+++ b/streamlit_pdf_viewer/frontend/vue.config.js
@@ -1,20 +1,24 @@
+const {VueLoaderPlugin} = require('vue-loader');
 module.exports = {
   publicPath: './',
   configureWebpack: {
+    target: 'web',
     module: {
       rules: [
         {
-          test: /\.js$/,
+          test: /\.(js|mjs)$/,
           include: /node_modules\/pdfjs-dist/,
           use: {
             loader: 'babel-loader',
             options: {
-              presets: ['@babel/preset-env'],
-              plugins: ['@babel/plugin-proposal-class-properties', '@babel/plugin-proposal-private-methods']
+              presets: [['@babel/preset-env', {targets: {esmodules: true}}]],
             }
           }
         }
       ]
-    }
+    },
+    plugins: [
+      new VueLoaderPlugin()
+    ],
   }
 }
\ No newline at end of file

From eb89aae6b6b137aae99d449e6a8fc25123b5da45 Mon Sep 17 00:00:00 2001
From: Luca Foppiano <luca@foppiano.org>
Date: Wed, 22 May 2024 18:41:22 +0900
Subject: [PATCH 07/10] adjust divs to get the text layers

---
 .../frontend/src/PdfViewer.vue                | 23 ++++++++++++++-----
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
index 5054908..1277107 100644
--- a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
+++ b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
@@ -130,9 +130,9 @@ export default {
       const textContent = await page.getTextContent();
       const textLayerDiv = document.createElement("div");
       textLayerDiv.className = "textLayer"
-      textLayerDiv.style.position = "absolute";
-      textLayerDiv.style.height = `${viewport.height}px`;
-      textLayerDiv.style.width = `${viewport.width}px`;
+      // textLayerDiv.style.position = "absolute";
+      // textLayerDiv.style.height = `${viewport.height}px`;
+      // textLayerDiv.style.width = `${viewport.width}px`;
       pdfjsLib.renderTextLayer({
         textContentSource: textContent,
         container: textLayerDiv,
@@ -140,10 +140,20 @@ export default {
         textDivs: []
       })
 
-      const pdfViewer = document.getElementById("pdfViewer");
-      pdfViewer.appendChild(textLayerDiv)
+      const pageDiv = document.createElement('div');
+      pageDiv.className = 'page';
+
+      const canvasWrapper = document.createElement('div');
+      canvasWrapper.className = 'canvasWrapper';
+      canvasWrapper.appendChild(canvas);
 
+      pageDiv.style = "position: relative;";
+
+      const pdfViewer = document.getElementById("pdfViewer");
+      pageDiv.appendChild(canvasWrapper);
+      pageDiv.appendChild(textLayerDiv);
 
+      pdfViewer.appendChild(pageDiv);
     };
 
     const renderPdfPages = async (pdf, pdfViewer, pagesToRender = null) => {
@@ -169,7 +179,8 @@ export default {
         pageHeights.value.push(unscaledViewport.height)
         if (pagesToRender.includes(pageNumber)) {
           const canvas = createCanvasForPage(page, scale, rotation, pageNumber)
-          pdfViewer?.append(canvas)
+          // pdfViewer?.append(canvas)
+          pdfViewer.style.setProperty('--scale-factor', scale);
 
           const viewport = page.getViewport({
             scale: pageScales.value[page._pageIndex],

From 467fc8cb62c630106318b9ecd02d380553f7d5a1 Mon Sep 17 00:00:00 2001
From: Luca Foppiano <luca@foppiano.org>
Date: Wed, 22 May 2024 19:59:33 +0900
Subject: [PATCH 08/10] Fix annotation visibility

---
 streamlit_pdf_viewer/frontend/src/PdfViewer.vue | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
index 1277107..eeae3db 100644
--- a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
+++ b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
@@ -2,13 +2,12 @@
   <div id="pdfContainer" :style="pdfContainerStyle">
     <div v-if="args.rendering==='unwrap'">
       <div id="pdfViewer" :style="pdfViewerStyle">
-        <!--        <div class="urlsAnnotations"></div>-->
-        <div id="pdfAnnotations" v-if="args.annotations">
-          <div v-for="(annotation, index) in filteredAnnotations" :key="index" :style="getPageStyle">
-            <div :style="getAnnotationStyle(annotation)" :id="`annotation-${index}`"></div>
-          </div>
+      <div id="pdfAnnotations" v-if="args.annotations">
+        <div v-for="(annotation, index) in filteredAnnotations" :key="index" :style="getPageStyle">
+          <div :style="getAnnotationStyle(annotation)" :id="`annotation-${index}`"></div>
         </div>
       </div>
+      </div>
     </div>
     <div v-else-if="args.rendering==='legacy_embed'">
       <embed :src="`data:application/pdf;base64,${args.binary}`" :width="`${args.width}`" :height="`${args.height}`" type="application/pdf"/>
@@ -89,7 +88,8 @@ export default {
         height: `${annoObj.height * scale}px`,
         outline: `${props.args.annotation_outline_size * scale}px solid`,
         outlineColor: annoObj.color,
-        cursor: 'pointer'
+        cursor: 'pointer',
+        'z-index': 10
       };
     };
 

From aabfacc6598ca6afc161bd89da634128d1ca8eda Mon Sep 17 00:00:00 2001
From: Luca Foppiano <luca@foppiano.org>
Date: Sat, 22 Jun 2024 17:52:28 +0900
Subject: [PATCH 09/10] enable renderText parameter

---
 streamlit_pdf_viewer/__init__.py              | 16 +++--
 .../frontend/src/PdfViewer.vue                | 59 +++++++++++--------
 2 files changed, 46 insertions(+), 29 deletions(-)

diff --git a/streamlit_pdf_viewer/__init__.py b/streamlit_pdf_viewer/__init__.py
index 4ced840..b28b065 100644
--- a/streamlit_pdf_viewer/__init__.py
+++ b/streamlit_pdf_viewer/__init__.py
@@ -25,7 +25,7 @@
     )
 
 
-def pdf_viewer(input: Union[str, Path, bytes], 
+def pdf_viewer(input: Union[str, Path, bytes],
                width: int = None,
                height: int = None,
                key=None,
@@ -33,7 +33,8 @@ def pdf_viewer(input: Union[str, Path, bytes],
                pages_vertical_spacing: int = 2,
                annotation_outline_size: int = 1,
                rendering: str = RENDERING_UNWRAP,
-               pages_to_render: List[int] = ()
+               pages_to_render: List[int] = (),
+               render_text: bool = False
                ):
     """
     pdf_viewer function to display a PDF file in a Streamlit app.
@@ -50,6 +51,7 @@ def pdf_viewer(input: Union[str, Path, bytes],
     "legacy_iframe" and "legacy_embed" which uses the legacy approach for showing PDF document with streamlit.
     These methods enable the default pdf viewer of Firefox/Chrome/Edge that contains additional features we are still
     working to implement for the "unwrap" method.
+    :param render_text: Whether to enable selection of text in the PDF viewer. Defaults to False.
 
     The function reads the PDF file (from a file path, URL, or binary data), encodes it in base64,
     and uses a Streamlit component to render it in the app. It supports optional annotations and adjustable margins.
@@ -73,7 +75,7 @@ def pdf_viewer(input: Union[str, Path, bytes],
 
     if rendering == RENDERING_IFRAME or rendering == RENDERING_EMBED:
         print(f"{RENDERING_IFRAME} and {RENDERING_EMBED} may not work consistently on all browsers "
-                     f"they might disapper in future releases.")
+              f"they might disapper in future releases.")
         if height is None:
             height = "100%"
 
@@ -88,7 +90,8 @@ def pdf_viewer(input: Union[str, Path, bytes],
         pages_vertical_spacing=pages_vertical_spacing,
         annotation_outline_size=annotation_outline_size,
         rendering=rendering,
-        pages_to_render=pages_to_render
+        pages_to_render=pages_to_render,
+        render_text=render_text
     )
     return component_value
 
@@ -97,11 +100,12 @@ def pdf_viewer(input: Union[str, Path, bytes],
     with open("resources/test.pdf", 'rb') as fo:
         binary = fo.read()
 
-    with open("resources/annotations.json", 'rb') as fo:
+    with open("resources/annotations.sample.json", 'rb') as fo:
         annotations = json.loads(fo.read())
 
     viewer = pdf_viewer(
         binary,
         width=800,
-        annotations=annotations
+        annotations=annotations,
+        render_text=True
     )
diff --git a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
index eeae3db..454a3a6 100644
--- a/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
+++ b/streamlit_pdf_viewer/frontend/src/PdfViewer.vue
@@ -53,6 +53,8 @@ export default {
       })
     });
 
+    const renderText = props.args.render_text === true
+
     const pdfContainerStyle = computed(() => ({
       width: props.args.width ? `${props.args.width}px` : `${maxWidth.value}px`,
       height: props.args.height ? `${props.args.height}px` : 'auto',
@@ -123,37 +125,48 @@ export default {
         canvasContext: canvas.getContext("2d"),
         viewport: viewport
       };
-
       const renderTask = page.render(renderContext);
       await renderTask.promise;
 
-      const textContent = await page.getTextContent();
-      const textLayerDiv = document.createElement("div");
-      textLayerDiv.className = "textLayer"
-      // textLayerDiv.style.position = "absolute";
-      // textLayerDiv.style.height = `${viewport.height}px`;
-      // textLayerDiv.style.width = `${viewport.width}px`;
-      pdfjsLib.renderTextLayer({
-        textContentSource: textContent,
-        container: textLayerDiv,
-        viewport: viewport,
-        textDivs: []
-      })
+      if (renderText) {
+        const textContent = await page.getTextContent();
+        const textLayerDiv = document.createElement("div");
+        textLayerDiv.className = "textLayer"
+        // textLayerDiv.style.position = "absolute";
+        // textLayerDiv.style.height = `${viewport.height}px`;
+        // textLayerDiv.style.width = `${viewport.width}px`;
+        pdfjsLib.renderTextLayer({
+          textContentSource: textContent,
+          container: textLayerDiv,
+          viewport: viewport,
+          textDivs: []
+        })
+        const pageDiv = document.createElement('div');
+        pageDiv.className = 'page';
 
-      const pageDiv = document.createElement('div');
-      pageDiv.className = 'page';
+        const canvasWrapper = document.createElement('div');
+        canvasWrapper.className = 'canvasWrapper';
+        canvasWrapper.appendChild(canvas);
 
-      const canvasWrapper = document.createElement('div');
-      canvasWrapper.className = 'canvasWrapper';
-      canvasWrapper.appendChild(canvas);
+        pageDiv.style = "position: relative;";
 
-      pageDiv.style = "position: relative;";
+        const pdfViewer = document.getElementById("pdfViewer");
+        pageDiv.appendChild(canvasWrapper);
+        pageDiv.appendChild(textLayerDiv);
+
+        pdfViewer.appendChild(pageDiv);
+      } else {
+        const pageDiv = document.createElement('div');
+        pageDiv.className = 'page';
 
-      const pdfViewer = document.getElementById("pdfViewer");
-      pageDiv.appendChild(canvasWrapper);
-      pageDiv.appendChild(textLayerDiv);
+        const canvasWrapper = document.createElement('div');
+        canvasWrapper.className = 'canvasWrapper';
+        canvasWrapper.appendChild(canvas);
 
-      pdfViewer.appendChild(pageDiv);
+        pageDiv.style = "position: relative;";
+        pageDiv.appendChild(canvasWrapper);
+        pdfViewer.appendChild(pageDiv);
+      }
     };
 
     const renderPdfPages = async (pdf, pdfViewer, pagesToRender = null) => {

From fc2025b279b9e75c4d90af00e4227d07e35fcb7e Mon Sep 17 00:00:00 2001
From: Luca Foppiano <luca@foppiano.org>
Date: Sat, 22 Jun 2024 17:55:44 +0900
Subject: [PATCH 10/10] add some documentation

---
 README.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 1c894da..320d03a 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,8 @@ In the following table the list of parameters that can be provided to the `pdf_v
 | pages_vertical_spacing  | The vertical space (in pixels) between each page of the PDF. Defaults to 2 pixels.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
 | annotation_outline_size | Size of the outline around each annotation in pixels. Defaults to 1 pixel.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
 | rendering               | Type of rendering: `unwrap` (default), `legacy_iframe`, or `legacy_embed`. The default value, `unwrap` shows the PDF document using pdf.js, and supports the visualisation of annotations. Other values are `legacy_iframe` and `legacy_embed` which use the legacy approach of injecting the document into an `<embed>` or `<iframe>`. They allow viewing the PDF using the viewer of the browser that contains additional features we are still working to implement in this component. **IMPORTANT**: :warning: The "legacy" methods **work only with Firefox**, and **do not support annotations**. :warning:|
-| pages_to_render         | Filter the rendering to a specific set of pages. By default, all pages are rendered.        |                                                                                                                                                                                                                                                                                                                                          
+| pages_to_render         | Filter the rendering to a specific set of pages. By default, all pages are rendered.        |
+| render_text             | Enable a layer of text on top of the PDF document. The text may be selected and copied. **NOTE** to avoid breaking existing deployments, we made this optional at first, also considering that having many annotations might interfere with the copy-paste.  
 
 
 ### Annotation format