diff --git a/revid/revid.go b/revid/revid.go
index 03c30696..b5abf168 100644
--- a/revid/revid.go
+++ b/revid/revid.go
@@ -112,6 +112,7 @@ type Revid struct {
 	// encoder holds the required encoders, which then write to destinations.
 	encoder []io.Writer
 
+	// writeClosers holds the senders that the encoders will write to.
 	writeClosers []io.WriteCloser
 
 	// bitrate hold the last send bitrate  calculation result.