diff --git a/config.yml b/config.yml
index 4e18a8b..4e60008 100644
--- a/config.yml
+++ b/config.yml
@@ -50,6 +50,8 @@ debug: true
 # How many days to keep tags but also keep the minimal count provided no matter how old.
 purge_tags_keep_days: 90
 purge_tags_keep_count: 2
+# Keep tags matching regexp no matter how old
+# purge_tags_keep_regexp: '^latest$'
 # Enable built-in cron to schedule purging tags in server mode.
 # Empty string disables this feature.
 # Example: '25 54 17 * * *' will run it at 17:54:25 daily.