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-rw-r--r--Documentation/lei-rediff.pod3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/lei-rediff.pod b/Documentation/lei-rediff.pod
index 5fdde230..e968fb20 100644
--- a/Documentation/lei-rediff.pod
+++ b/Documentation/lei-rediff.pod
@@ -24,7 +24,8 @@ supported.
 
 =item --stdin
 
-Read message from stdin.
+Read message from stdin.  This is implicit if no arguments are given
+and stdin is a pipe or regular file.
 
 =item --git-dir=DIR