diff --git a/packages/core/src/metadata/directives.ts b/packages/core/src/metadata/directives.ts
index dbb9258258..b9a96ff639 100644
--- a/packages/core/src/metadata/directives.ts
+++ b/packages/core/src/metadata/directives.ts
@@ -469,10 +469,8 @@ export interface Directive {
 /**
  * Type of the Component metadata.
  */
-export const Directive: DirectiveDecorator = makeDecorator(
-    'Directive', (dir: Directive = {}) => dir, undefined, undefined,
-    (type: Type<any>, meta: Directive) => (R3_COMPILE_DIRECTIVE || (() => {}))(type, meta));
-
+export const Directive: DirectiveDecorator =
+    makeDecorator('Directive', (dir: Directive = {}) => dir);
 /**
  * Component decorator interface
  *
diff --git a/packages/core/src/metadata/ng_module.ts b/packages/core/src/metadata/ng_module.ts
index 01482686d7..26ebcc2cf1 100644
--- a/packages/core/src/metadata/ng_module.ts
+++ b/packages/core/src/metadata/ng_module.ts
@@ -199,6 +199,9 @@ export interface NgModule {
 }
 
 /**
+ * Decorator that marks the following class as an NgModule, and supplies
+ * configuration metadata for it.
+ *
  * @Annotation
  */
 export const NgModule: NgModuleDecorator = makeDecorator(