diff --git a/black.toml b/black.toml
--- a/black.toml
+++ b/black.toml
@@ -11,6 +11,7 @@ build/
 | mercurial/thirdparty/
 | hgext/fsmonitor/pywatchman/
 | contrib/python-zstandard/
+| contrib/grey.py
 '''
 skip-string-normalization = true
 quiet = true
diff --git a/contrib/examples/fix.hgrc b/contrib/examples/fix.hgrc
--- a/contrib/examples/fix.hgrc
+++ b/contrib/examples/fix.hgrc
@@ -12,4 +12,4 @@ rustfmt:pattern = set:**.rs
 # to have the dependencies for grey.
 #
 # black:command = python3.7 contrib/grey.py --config=black.toml -
-# black:pattern = set:**.py - hgext/fsmonitor/pywatchman/** - mercurial/thirdparty/** - "contrib/python-zstandard/**"
+# black:pattern = set:**.py - hgext/fsmonitor/pywatchman/** - mercurial/thirdparty/** - "contrib/python-zstandard/** - contrib/grey.py"