diff --git a/test/index.go b/test/index.go
index f9e2413..447d708 100644
--- a/test/index.go
+++ b/test/index.go
@@ -4,6 +4,9 @@
 // ./$A.out -pass 2 >tmp.go && errchk $G -e tmp.go
 // rm -f tmp.go $A.out1
 
+// NOTE: This test is not run by 'run.go' and so not run by all.bash.
+// To run this test you must use the ./run shell script.
+
 // Copyright 2010 The Go Authors.  All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.