diff --git a/Documentation/images/user-review-ui-side-by-side-diff-screen-no-differences.png b/Documentation/images/user-review-ui-side-by-side-diff-screen-no-differences.png
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diff --git a/Documentation/user-review-ui.txt b/Documentation/user-review-ui.txt
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--- a/Documentation/user-review-ui.txt
+++ b/Documentation/user-review-ui.txt
@@ -750,6 +750,11 @@ comparing the old patch against the current patch.
 
 image::images/user-review-ui-side-by-side-diff-screen-patch-sets.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-patch-sets.png"]
 
+If the compared patches are identical, this is highlighted by a red
+`No Differences` label in the screen header.
+
+image::images/user-review-ui-side-by-side-diff-screen-no-differences.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-no-differences.png"]
+
 The download icon next to the patch set list allows to download the
 patch. Unless the mime type of the file is configured as safe, the
 download file is a zip archive that contains the patch file.