diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 06500d04b7..32005b03f3 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -4,10 +4,6 @@
 -u::
 	Synonym for "-p".
 
--r::
-	Look recursively in subdirectories; only used by "git-diff-tree";
-	other diff commands always work recursively.
-
 -z::
 	\0 line termination on output