diff --git a/src/charm.py b/src/charm.py
index 8e41c612a..103fb481b 100755
--- a/src/charm.py
+++ b/src/charm.py
@@ -599,6 +599,8 @@ def _on_secret_changed(self, event: SecretChangedEvent):
             return
         logging.debug("Secret %s for scope %s changed, refreshing", event.secret.id, scope)
         self._update_juju_secrets_cache(scope)
+
+        # changed secrets means that the URIs used for PBM and mongodb_exporter are now out of date
         self._connect_mongodb_exporter()
         self._connect_pbm_agent()