diff --git a/pip/pip-399.md b/pip/pip-399.md
index 0483929d2179b..ff33907d4b67d 100644
--- a/pip/pip-399.md
+++ b/pip/pip-399.md
@@ -90,5 +90,5 @@ Only superuser can access the admin API.
 
 # Links
 
-* Mailing List discussion thread:
+* Mailing List discussion thread: https://lists.apache.org/thread/bq7g3916fvh5xskvkn6bnynfy8zmr5mo
 * Mailing List voting thread: