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diff --git a/iPhone/GTMUIView+SubtreeDescription.h b/iPhone/GTMUIView+SubtreeDescription.h
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+//
+//  GTMUIView+SubtreeDescription.h
+//
+//  Copyright 2009 Google Inc.
+//
+//  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.
+//
+#import <UIKit/UIKit.h>
+
+// This entire file, and the corresponding .m is DEBUG only.
+// But you can define INCLUDE_UIVIEW_SUBTREE_DESCRIPTION to no-zero to override.
+#if DEBUG || INCLUDE_UIVIEW_SUBTREE_DESCRIPTION
+
+// Example, in debugger, pause the program, then type:
+// po [[[UIApplication sharedApplication] keyWindow] subtreeDescription]
+
+@interface UIView (SubtreeDescription)
+
+// Returns one line, without leading indent, but with a trailing newline,
+// describing the view.
+// If you define a |myViewDescriptionLine| method in your own UIView classes,
+// this will append that result to its description.
+- (NSString *)gtm_subtreeDescriptionLine;
+
+// For debugging. Returns a nicely indented representation of this view's
+// subview hierarchy, each with frame and isHidden.
+- (NSString *)subtreeDescription;
+
+// For debugging. Returns a nicely indented representation of this view's
+// layer hierarchy, with frames and isHidden.
+// Requires QuartzCore to be useful, but your app will still link without it.
+// TODO: should there be an analog of myViewDescriptionLine for layers?
+- (NSString *)sublayersDescription;
+
+@end
+
+#endif  // DEBUG