diff --git a/Patches.md b/Patches.md
index 9c4310c..23c940d 100644
--- a/Patches.md
+++ b/Patches.md
@@ -17,6 +17,6 @@ And attach it to the ticket.
 
 Please use a filename like `*.darcs.patch` so that Trac will display it with proper syntax highlighting.
 
-Or without darcs you can attach a normal old unified diff. If you do that, please use a filename like `*.patch` so that Trac will display it with syntax highlighting. (If using darcs, you can generate a unified diff with `darcs whatsnew --unified`.)
+Or without darcs you can attach a normal old unified diff. If you do that, please use a filename like `*.diff` so that Trac will display it with syntax highlighting. (If using darcs, you can generate a unified diff with `darcs whatsnew --unified`.)
 
 Then add the keyword `review-needed` (spelled just like that) to the Keywords field of the ticket.
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