diff --git a/revid/mtsSender_test.go b/revid/mtsSender_test.go
index 63b1758b..ad4a18ba 100644
--- a/revid/mtsSender_test.go
+++ b/revid/mtsSender_test.go
@@ -101,7 +101,7 @@ func log(lvl int8, msg string, args ...interface{}) {
 // ring buffer used in tests.
 type buffer ring.Buffer
 
-// Write writes to b.
+// Write implements the io.Writer interface.
 func (b *buffer) Write(d []byte) (int, error) {
 	r := (*ring.Buffer)(b)
 	n, err := r.Write(d)