diff --git a/codec/h265/lex.go b/codec/h265/lex.go
index 6af405d7..3d820ef1 100644
--- a/codec/h265/lex.go
+++ b/codec/h265/lex.go
@@ -74,7 +74,7 @@ func (l *Lexer) Lex(dst io.Writer, src io.Reader, delay time.Duration) error {
 	for {
 		n, err := src.Read(buf)
 		switch err {
-		case nil:
+		case nil: // Do nothing.
 		case io.EOF:
 			return nil
 		default: