diff --git a/gerrit-prettify/src/main/java/com/google/gerrit/prettify/common/PrettifyConstants.java b/gerrit-prettify/src/main/java/com/google/gerrit/prettify/common/PrettifyConstants.java
new file mode 100644
index 0000000..346688e
--- /dev/null
+++ b/gerrit-prettify/src/main/java/com/google/gerrit/prettify/common/PrettifyConstants.java
@@ -0,0 +1,25 @@
+// Copyright (C) 2010 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.prettify.common;
+
+import com.google.gwt.core.client.GWT;
+import com.google.gwt.i18n.client.Constants;
+
+public interface PrettifyConstants extends Constants {
+  static final PrettifyConstants C = GWT.create(PrettifyConstants.class);
+
+  String wseTabAfterSpace();
+  String wseTrailingSpace();
+}
diff --git a/gerrit-prettify/src/main/java/com/google/gerrit/prettify/common/PrettifyConstants.properties b/gerrit-prettify/src/main/java/com/google/gerrit/prettify/common/PrettifyConstants.properties
new file mode 100644
index 0000000..5cb864b
--- /dev/null
+++ b/gerrit-prettify/src/main/java/com/google/gerrit/prettify/common/PrettifyConstants.properties
@@ -0,0 +1,2 @@
+wseTabAfterSpace=Whitespace error: Tab after space
+wseTrailingSpace=Whitespace error: Trailing space at end of line