diff --git a/src/net/udpsock.go b/src/net/udpsock.go
index 6a4aaf9e59..841ef53359 100644
--- a/src/net/udpsock.go
+++ b/src/net/udpsock.go
@@ -15,8 +15,8 @@ import (
 // BUG(mikio): On Windows, the File method of UDPConn is not
 // implemented.
 
-// BUG(mikio): On NaCl the ListenMulticastUDP function is
-// not implemented.
+// BUG(mikio): On NaCl, the ListenMulticastUDP function is not
+// implemented.
 
 // UDPAddr represents the address of a UDP end point.
 type UDPAddr struct {