diff --git a/modules/angular2/src/core/di/type_literal.ts b/modules/angular2/src/core/di/type_literal.ts
index 3f755c7a4f..e91ebf3516 100644
--- a/modules/angular2/src/core/di/type_literal.ts
+++ b/modules/angular2/src/core/di/type_literal.ts
@@ -1,4 +1,5 @@
 /**
+ * @private
  * Type literals is a Dart-only feature. This is here only so we can x-compile
  * to multiple languages.
  */