diff --git a/storage/swift.py b/storage/swift.py
index 5fcc98a96..ddeae9105 100644
--- a/storage/swift.py
+++ b/storage/swift.py
@@ -106,6 +106,8 @@ class SwiftStorage(BaseStorage):
                                         chunk_size=chunk, content_type=content_type,
                                         headers=headers)
     except ClientException:
+      # We re-raise client exception here so that validation of config during setup can see
+      # the client exception messages.
       raise
     except Exception:
       logger.exception('Could not put object: %s', path)