diff --git a/media/mtp/MtpDatabase.h b/media/mtp/MtpDatabase.h
index bbbbc38..02bb0d9 100644
--- a/media/mtp/MtpDatabase.h
+++ b/media/mtp/MtpDatabase.h
@@ -61,7 +61,14 @@
     virtual MtpResponseCode         getObjectFilePath(MtpObjectHandle handle,
                                             MtpString& filePath,
                                             int64_t& fileLength) = 0;
+
     virtual MtpResponseCode         deleteFile(MtpObjectHandle handle) = 0;
+
+    virtual MtpObjectHandleList*    getObjectReferences(MtpObjectHandle handle) = 0;
+
+    virtual MtpResponseCode         setObjectReferences(MtpObjectHandle handle,
+                                            MtpObjectHandleList* references) = 0;
+
 };
 
 }; // namespace android