diff --git a/wcfs/wcfs.go b/wcfs/wcfs.go
index bf8f2830a6e75457af309bd49115d507fb7f815b..8afdcac0349d4cf950f441cad6f18f2cf3c446aa 100644
--- a/wcfs/wcfs.go
+++ b/wcfs/wcfs.go
@@ -433,6 +433,7 @@ package main
 //
 // WatchLink.byfileMu	> Watch.atMu
 // BigFile.watchMu      > Watch.atMu
+// WatchLink.byfileMu	> BigFileDir.fileMu
 
 import (
 	"bufio"