diff --git a/hub_sdk/base/api_client.py b/hub_sdk/base/api_client.py
index 1710f43..f2d2cd8 100644
--- a/hub_sdk/base/api_client.py
+++ b/hub_sdk/base/api_client.py
@@ -31,6 +31,7 @@ def __init__(self, message: str, status_code: Optional[int] = None):
         self.message = message
 
     def __str__(self) -> str:
+        """Returns a string representation of the APIClientError instance."""
         return f"{self.__class__.__name__}: {self.args[0]}"