diff --git a/src/vs/workbench/workbench.web.api.ts b/src/vs/workbench/workbench.web.api.ts
index b04c4d6d77d..4311eeffef0 100644
--- a/src/vs/workbench/workbench.web.api.ts
+++ b/src/vs/workbench/workbench.web.api.ts
@@ -344,7 +344,8 @@ interface IWorkbenchConstructionOptions {
 	readonly additionalBuiltinExtensions?: readonly (ExtensionId | UriComponents)[];
 
 	/**
-	 * List of extensions to be enabled.
+	 * List of extensions to be enabled if they are installed.
+	 * Note: This will not install extensions if not installed.
 	 */
 	readonly enabledExtensions?: readonly ExtensionId[];