diff --git a/python/lang/correctness/list-modify-iterating.yaml b/python/lang/correctness/list-modify-iterating.yaml
index 33dac7f882..174edcefff 100644
--- a/python/lang/correctness/list-modify-iterating.yaml
+++ b/python/lang/correctness/list-modify-iterating.yaml
@@ -30,3 +30,5 @@ rules:
       category: correctness
       technology:
         - python
+      references:
+        - https://unspecified.wordpress.com/2009/02/12/thou-shalt-not-modify-a-list-during-iteration/