diff --git a/include/camera/IProCameraUser.h b/include/camera/IProCameraUser.h
index 45b818c..2ccc4d2 100644
--- a/include/camera/IProCameraUser.h
+++ b/include/camera/IProCameraUser.h
@@ -34,6 +34,9 @@
 
 class IProCameraUser: public IInterface
 {
+    /**
+     * Keep up-to-date with IProCameraUser.aidl in frameworks/base
+     */
 public:
     DECLARE_META_INTERFACE(ProCameraUser);