Reword comment

src/charm.py

@@ -540,9 +540,9 @@ def _on_upgrade_charm(self, _event: UpgradeCharmEvent) -> None:
             state.runner_config.virtual_machine_resources,
         )
 
-        # Ensure an update of the systemd timer for reconciliation event is written to disk.
-        # upgrade_charm event is not followed by a config changed event (which updates the timer)
-        # so the timer would otherwise not be updated.
+        # Ensure that an update to the systemd timer for reconciliation event is written to disk.
+        # The upgrade_charm event is not necessarily followed by a config changed event
+        # (which updates the timer), so we need to explicitly update the timer here.
         self._set_reconcile_timer()
 
     @catch_charm_errors