diff --git a/bash/fix_annotations.sh b/bash/fix_annotations.sh
index 47d882a..668bb89 100755
--- a/bash/fix_annotations.sh
+++ b/bash/fix_annotations.sh
@@ -1,6 +1,8 @@
 #!/bin/bash
 
 # Upgrades a project using lintrunner to use Python 3.9 style annotations
+# Uses this Python script:
+# https://github.com/rec/test/blob/master/python/add_annotations.py
 
 python ~/code/test/python/add_annotations.py $@
 pyupgrade --py39-plus $@