diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 19c03c496..668dcfdc6 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -272,10 +272,7 @@ Coding Guide
   generated output.
 
 * When adding a new configuration variable, be sure to document it and update
-  :file:`sphinx/quickstart.py` if it's important enough.
-
-* Use the included :program:`utils/check_sources.py` script to check for
-  common formatting issues (trailing whitespace, lengthy lines, etc).
+  :file:`sphinx/cmd/quickstart.py` if it's important enough.
 
 * Add appropriate unit tests.