diff --git a/cylc/uiserver/websockets/resolve.py b/cylc/uiserver/websockets/resolve.py
index 4c298669..71bb8f23 100644
--- a/cylc/uiserver/websockets/resolve.py
+++ b/cylc/uiserver/websockets/resolve.py
@@ -28,7 +28,7 @@
 """
 
 # NOTE: transient dependency from graphql-ws purposefully not
-# reflected in cylc-uiserver dependencies 
+# reflected in cylc-uiserver dependencies
 from promise import Promise
 
 from graphql_ws.base_async import is_awaitable