diff --git a/maint/scripts/run_fixers.py b/maint/scripts/run_fixers.py
index cfa2c36c..3327634f 100755
--- a/maint/scripts/run_fixers.py
+++ b/maint/scripts/run_fixers.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python
+# Usage is like 2to3:
+# $ maint/scripts/run_fixers.py -wn --no-diffs tornado
 
 import sys
 from lib2to3.main import main