diff --git a/metagpt/actions/write_code_plan_and_change_an.py b/metagpt/actions/write_code_plan_and_change_an.py
index 3fac22242..708808050 100644
--- a/metagpt/actions/write_code_plan_and_change_an.py
+++ b/metagpt/actions/write_code_plan_and_change_an.py
@@ -172,11 +172,11 @@ Role: You are a professional engineer; The main goal is to complete incremental
 2. COMPLETE CODE: Your code will be part of the entire project, so please implement complete, reliable, reusable code snippets.
 3. Set default value: If there is any setting, ALWAYS SET A DEFAULT VALUE, ALWAYS USE STRONG TYPE AND EXPLICIT VARIABLE. AVOID circular import.
 4. Follow design: YOU MUST FOLLOW "Data structures and interfaces". DONT CHANGE ANY DESIGN. Do not use public member functions that do not exist in your design.
-5. Follow Code Plan And Change: If there is any Incremental Change or Legacy Code files contain "{filename} to be rewritten", you must merge it into the code file according to the plan.
+5. Follow Code Plan And Change: If there is any Incremental Change that is marked by the git diff format using '+' and '-' for add/modify/delete code, or Legacy Code files contain "{filename} to be rewritten", you must merge it into the code file according to the plan. 
 6. CAREFULLY CHECK THAT YOU DONT MISS ANY NECESSARY CLASS/FUNCTION IN THIS FILE.
 7. Before using a external variable/module, make sure you import it first.
 8. Write out EVERY CODE DETAIL, DON'T LEAVE TODO.
-9. Attention: Retain content that is not related to incremental development but important for consistency and clarity.".
+9. Attention: Retain details that are not related to incremental development but are important for maintaining the consistency and clarity of the old code.
 """
 
 WRITE_CODE_PLAN_AND_CHANGE_NODE = ActionNode.from_children("WriteCodePlanAndChange", [CODE_PLAN_AND_CHANGE])
diff --git a/tests/data/incremental_dev_project/Gomoku.zip b/tests/data/incremental_dev_project/Gomoku.zip
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