diff --git a/prefs_interface.h b/prefs_interface.h
index 8d07dde..ddebb3b 100644
--- a/prefs_interface.h
+++ b/prefs_interface.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -19,6 +19,7 @@
 extern const char kPrefsUpdateStateNextDataOffset[];
 extern const char kPrefsUpdateStateNextOperation[];
 extern const char kPrefsUpdateStateSHA256Context[];
+extern const char kPrefsUpdateStateSignatureBlob[];
 extern const char kPrefsUpdateStateSignedSHA256Context[];
 
 // The prefs interface allows access to a persistent preferences