diff --git a/metagpt/actions/action_node.py b/metagpt/actions/action_node.py
index 0f441cfee..ed0e27869 100644
--- a/metagpt/actions/action_node.py
+++ b/metagpt/actions/action_node.py
@@ -23,7 +23,8 @@ from metagpt.utils.common import OutputParser, general_after_log
 TAG = "CONTENT"
 
 LANGUAGE_CONSTRAINT = "Language: Please use the same language as Human INPUT."
-FORMAT_CONSTRAINT = f"Format: output wrapped inside [{TAG}][/{TAG}] like format example, nothing else."
+FORMAT_CONSTRAINT = (f"Format: output wrapped inside [{TAG}][/{TAG}] like format example, nothing else. "
+                     f"Delete comments in json")
 # Delete comments in json
 # If you don't want JSONDecodeError to occur, you can add Delete comments in json after FORMAT_CONSTRAINT