diff --git a/src/agentscope/agents/rpc_agent.py b/src/agentscope/agents/rpc_agent.py
index dce77778e..b7c3441bc 100644
--- a/src/agentscope/agents/rpc_agent.py
+++ b/src/agentscope/agents/rpc_agent.py
@@ -430,7 +430,7 @@ def __init__(
             local_mode (`bool`, defaults to `False`):
                 Whether the started rpc server only listens to local
                 requests.
-            custom_agents: (`list`, defaults to `None`):
+            custom_agents (`list`, defaults to `None`):
                 A list of custom agent classes that are not in
                 `agentscope.agents`.
             agent_class (`Type[AgentBase]`, deprecated):