diff --git a/rageval/metrics/answer_groundedness/_claim_faithfulness.py b/rageval/metrics/answer_groundedness/_claim_faithfulness.py
index 2bdde4e..7ea840b 100644
--- a/rageval/metrics/answer_groundedness/_claim_faithfulness.py
+++ b/rageval/metrics/answer_groundedness/_claim_faithfulness.py
@@ -36,7 +36,7 @@
     ...     ]
     ... }
     >>> dataset = Dataset.from_dict(sample)
-    >>> metric = ClaimFaithfulness(model = "openai//home/gomall/models/Qwen2-7B-Instruct", api_base = "http://project.gomall.ac.cn:30590/notebook/tensorboard/wangwenshan/1161/v1"， api_key = "sk-123456789")
+    >>> metric = ClaimFaithfulness(model = "openai//home/gomall/models/Qwen2-7B-Instruct", api_base = "http://project.gomall.ac.cn:30590/notebook/tensorboard/wangwenshan/1161/v1", api_key = "sk-123456789")
     >>> metric.mtype
     'answer_informativeness'
 """