make statement about *.stderr files clearer

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b7f68dc854de2171329736f6e8b3c801f67d37ef..d481cfe0fa90c17dca679b01c87b5b5b74b9e1f8 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -43,7 +43,7 @@ travis build actually checks for this.
 Clippy uses UI tests. UI tests check that the output of the compiler is exactly as expected.
 Of course there's little sense in writing the output yourself or copying it around.
 Therefore you can simply run `tests/ui/update-all-references.sh` and check whether
-the output looks as you expect with `git diff`. Commit all `.stderr` files, too.
+the output looks as you expect with `git diff`. Commit all `*.stderr` files, too.
 
 Also please document your lint with a doc comment akin to the following:
 ```rust