diff --git a/packages/schematics/angular/application/schema.json b/packages/schematics/angular/application/schema.json
index 7c6c76f27515..e1281ce738d7 100644
--- a/packages/schematics/angular/application/schema.json
+++ b/packages/schematics/angular/application/schema.json
@@ -114,7 +114,8 @@
     "legacyBrowsers": {
       "type": "boolean",
       "description": "Add support for legacy browsers like Internet Explorer using differential loading.",
-      "default": false
+      "default": false,
+      "x-deprecated": "Legacy browsers support is deprecated since version 12. For more information, see https://angular.io/guide/browser-support"
     }
   },
   "required": [
diff --git a/packages/schematics/angular/ng-new/schema.json b/packages/schematics/angular/ng-new/schema.json
index 8ea24ad163f7..71ac500eb25b 100644
--- a/packages/schematics/angular/ng-new/schema.json
+++ b/packages/schematics/angular/ng-new/schema.json
@@ -136,7 +136,8 @@
     "legacyBrowsers": {
       "type": "boolean",
       "description": "Add support for legacy browsers like Internet Explorer using differential loading.",
-      "default": false
+      "default": false,
+      "x-deprecated": "Legacy browsers support is deprecated since version 12. For more information, see https://angular.io/guide/browser-support"
     },
     "packageManager": {
       "description": "The package manager used to install dependencies.",