diff --git a/astutil/imports.go b/astutil/imports.go
index c3128103..1675aa62 100644
--- a/astutil/imports.go
+++ b/astutil/imports.go
@@ -1,3 +1,7 @@
+// Copyright 2013 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.
+
 // Package astutil contains common utilities for working with the Go AST.
 package astutil
 
diff --git a/astutil/imports_test.go b/astutil/imports_test.go
index 27f69979..774811cc 100644
--- a/astutil/imports_test.go
+++ b/astutil/imports_test.go
@@ -1,3 +1,7 @@
+// Copyright 2013 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.
+
 package astutil
 
 import (
diff --git a/go/types/typestring.go b/go/types/typestring.go
index 77323415..9f4905c2 100644
--- a/go/types/typestring.go
+++ b/go/types/typestring.go
@@ -115,8 +115,9 @@ func WriteType(buf *bytes.Buffer, this *Package, typ Type) {
 			s = "<-chan "
 		default:
 			s = "chan "
-			if c, _ := t.elem.(*Chan); c != nil {
-				parens = c.dir == ast.RECV
+			// chan (<-chan T) requires parentheses
+			if c, _ := t.elem.(*Chan); c != nil && c.dir == ast.RECV {
+				parens = true
 			}
 		}
 		buf.WriteString(s)