diff --git a/clearml/backend_api/utils.py b/clearml/backend_api/utils.py
index 48c474fa..a0bc7073 100644
--- a/clearml/backend_api/utils.py
+++ b/clearml/backend_api/utils.py
@@ -92,6 +92,7 @@ class TLSv1HTTPAdapter(HTTPAdapter):
 
 
 class SessionWithTimeout(requests.Session):
+    """requests.Session with a send timeout for requests with a content length header"""
     write_timeout = (300.0, 300.0)
     request_size_threshold = 15000