diff --git a/icmp/listen_stub.go b/icmp/listen_stub.go
index 668728d1..6b77ab48 100644
--- a/icmp/listen_stub.go
+++ b/icmp/listen_stub.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build nacl plan9
+// +build js nacl plan9
 
 package icmp
 
diff --git a/icmp/message.go b/icmp/message.go
index 46fe95ab..c9329a2f 100644
--- a/icmp/message.go
+++ b/icmp/message.go
@@ -25,7 +25,7 @@ import (
 	"golang.org/x/net/ipv6"
 )
 
-// BUG(mikio): This package is not implemented on NaCl and Plan 9.
+// BUG(mikio): This package is not implemented on JS, NaCl and Plan 9.
 
 var (
 	errMessageTooShort  = errors.New("message too short")