diff --git a/gslides_api/client.py b/gslides_api/client.py
index 54a9ecf..b8572a0 100644
--- a/gslides_api/client.py
+++ b/gslides_api/client.py
@@ -472,6 +472,7 @@ def _get_thumbnail():
 logger = logging.getLogger(__name__)
 
 
+# TODO: initialize_global_client() function instead of this
 def initialize_credentials(credential_location: str):
     """