diff --git a/services/medialog/MediaLogService.h b/services/medialog/MediaLogService.h
index 06c721f..e9211b4 100644
--- a/services/medialog/MediaLogService.h
+++ b/services/medialog/MediaLogService.h
@@ -55,7 +55,7 @@
 
     Mutex               mLock;
 
-    Vector<NBLog::NamedReader> mNamedReaders;
+    Vector<NBLog::NamedReader> mNamedReaders;   // protected by mLock
     NBLog::Shared *mMergerShared;
     NBLog::Merger mMerger;
     NBLog::MergeReader mMergeReader;