diff --git a/metagpt/ext/aflow/scripts/prompts/optimize_prompt.py b/metagpt/ext/aflow/scripts/prompts/optimize_prompt.py
index 231506a37..a2e862ec2 100644
--- a/metagpt/ext/aflow/scripts/prompts/optimize_prompt.py
+++ b/metagpt/ext/aflow/scripts/prompts/optimize_prompt.py
@@ -17,7 +17,7 @@ WORKFLOW_INPUT = """
 Here is a graph and the corresponding prompt (prompt only related to the custom method) that performed excellently in a previous iteration (maximum score is 1). You must make further optimizations and improvements based on this graph. The modified graph must differ from the provided example, and the specific differences should be noted within the <modification>xxx</modification> section.\n
 <sample>
     <experience>{experience}</experience>
-    <modification>(such as:add a review step/delete a operator/modify a prompt)</modification>
+    <modification>(such as:add /delete /modify/ ...)</modification>
     <score>{score}</score>
     <graph>{graph}</graph>
     <prompt>{prompt}</prompt>(only prompt_custom)