diff --git a/packages/toolbox-core/src/toolbox_core/client.py b/packages/toolbox-core/src/toolbox_core/client.py
index de4e4107..50ed74f2 100644
--- a/packages/toolbox-core/src/toolbox_core/client.py
+++ b/packages/toolbox-core/src/toolbox_core/client.py
@@ -28,7 +28,8 @@ class ToolboxClient:
     An asynchronous client for interacting with a Toolbox service.
 
     Provides methods to discover and load tools defined by a remote Toolbox
-    service endpoint. It manages an underlying `aiohttp.ClientSession`.
+    service endpoint. It manages an underlying `aiohttp.ClientSession`, if one
+    is not provided.
     """
 
     __base_url: str