diff --git a/sky/engine/bindings/jni/jni.dart b/sky/engine/bindings/jni/jni.dart
index d6122e55c5bee3098dc02b87d3b0bdce90ce9125..1c88c69320ba9677e20e7070b89fc6e78cea8b57 100644
--- a/sky/engine/bindings/jni/jni.dart
+++ b/sky/engine/bindings/jni/jni.dart
@@ -3,6 +3,8 @@
 // found in the LICENSE file.
 
 /// Invoke Java Native Interface APIs from Dart.
+///
+/// To use, import `dart:jni`.
 library dart_jni;
 
 import 'dart:collection';