diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b2d73f72..6e3a8bc31 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ Improvements:
 - Add support for "Configure", "Install" and "Test" tasks. [#2452](https://github.com/microsoft/vscode-cmake-tools/issues/2452)
 - Add setting `cmake.ignoreCMakeListsMissing`. [PR #2537](https://github.com/microsoft/vscode-cmake-tools/pull/2537) [@ilg-ul](https://github.com/ilg-ul)
 - Add support for "Clean" and "Clean Rebuild" tasks. [#2555](https://github.com/microsoft/vscode-cmake-tools/issues/2555)
+- The extension for CMake language support is replaced. [PR #2267](https://github.com/microsoft/vscode-cmake-tools/pull/2267) [@josetr](https://github.com/josetr)
 
 Bug Fixes:
 - `Clean All Projects` menu item builds rather than cleans. [#2460](https://github.com/microsoft/vscode-cmake-tools/issues/2460)
@@ -25,7 +26,6 @@ Bug Fixes:
 - Select the correct VS toolset for Ninja generators with CMake Presets. [#2423](https://github.com/microsoft/vscode-cmake-tools/issues/2423)
 - Fix unhandled exception with CMakePresets.json. [#2117](https://github.com/microsoft/vscode-cmake-tools/issues/2117)
 - Fix issues with compiler argument quoting when configuring IntelliSense. [#2563](https://github.com/microsoft/vscode-cmake-tools/pull/2563)
-- Add support for cpptools API V6. [2508](https://github.com/microsoft/vscode-cmake-tools/issues/2508)
 
 ## 1.10.5
 Bug Fixes:
diff --git a/src/extension.ts b/src/extension.ts
index 7378a3c65..4896e6f6d 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1795,6 +1795,15 @@ export async function activate(context: vscode.ExtensionContext) {
     if (oldCMakeToolsExtension) {
         await vscode.window.showWarningMessage(localize('uninstall.old.cmaketools', 'Please uninstall any older versions of the CMake Tools extension. It is now published by Microsoft starting with version 1.2.0.'));
     }
+    // Inform the users that the language support extension has been modified.
+    const isOldLanguageSupportInformed = context.globalState.get('oldLanguageSupportInformed', false);
+    if (!isOldLanguageSupportInformed) {
+        const oldLanguageSupport = vscode.extensions.getExtension('twxs.cmake');
+        if (oldLanguageSupport) {
+            await context.globalState.update('oldLanguageSupportInformed', true);
+            void vscode.window.showInformationMessage(localize('uninstall.old.language.support', 'CMake Tools now bundles a new language support extension for CMakeLists.txt files and recommends that you uninstall the previous CMake language support extension by twxs.'));
+        }
+    }
 
     // Start with a partial feature set view. The first valid CMake project will cause a switch to full feature set.
     await enableFullFeatureSet(false);