From 48fa1f92aac40604e15ce0263fdc33de387efb78 Mon Sep 17 00:00:00 2001
From: Jerry Ling <proton@jling.dev>
Date: Thu, 31 Aug 2023 07:11:16 -0400
Subject: [PATCH] add notify(img) doc for in-place Observable update (#3195)

---
 docs/explanations/nodes.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docs/explanations/nodes.md b/docs/explanations/nodes.md
index b59567409bb..2d801eccd39 100644
--- a/docs/explanations/nodes.md
+++ b/docs/explanations/nodes.md
@@ -72,6 +72,9 @@ nothing # hide
 ```
 \show{code3}
 
+!!! note
+    If you updated the `Observable` using in-place syntax (e.g. `img[] .= colorant"red"`), you need to manually
+    `notify(img)` to trigger the function.
 
 !!! note
     All registered functions in a `Observable` are executed synchronously in the order of registration.