diff --git a/src/agentscope/agents/react_agent.py b/src/agentscope/agents/react_agent.py
index afcd0ad05..87025afdd 100644
--- a/src/agentscope/agents/react_agent.py
+++ b/src/agentscope/agents/react_agent.py
@@ -109,7 +109,7 @@ def __init__(
 
         # Initialize a parser object to formulate the response from the model
         self.parser = RegexTaggedContentParser(
-            format_instruction="""Respond with specific tags as outlined below in json format:
+            format_instruction="""Respond with specific tags as outlined below:
 <thought>{what you thought}</thought>
 <function>{the function name you want to call}</function>
 <{argument name}>{argument value}</{argument name}>