diff --git a/src/google/adk/tools/transfer_to_agent_tool.py b/src/google/adk/tools/transfer_to_agent_tool.py
index b791a25..6d2a5a9 100644
--- a/src/google/adk/tools/transfer_to_agent_tool.py
+++ b/src/google/adk/tools/transfer_to_agent_tool.py
@@ -16,5 +16,12 @@ from .tool_context import ToolContext
 
 
 def transfer_to_agent(agent_name: str, tool_context: ToolContext):
-  """Transfer the question to another agent."""
+  """Transfer the question to another agent.
+
+  This tool hands off control to another agent when it's more suitable to 
+  answer the user's question according to the agent's description.
+  
+  Args:
+    agent_name: the agent name to transfer to.
+  """
   tool_context.actions.transfer_to_agent = agent_name