diff --git a/app_prd/Auto cut docx to questions.md b/app_prd/Auto cut docx to questions.md
index 2cded88..099a8cd 100644
--- a/app_prd/Auto cut docx to questions.md	
+++ b/app_prd/Auto cut docx to questions.md	
@@ -17,4 +17,4 @@ json格式的schema：
 	6. methods: 题目中包含的方法，通过summary_api 获得，json格式：["method1","method2","method3"]；
 	7. updated_knowledges;同knowledges，经过人工审核过的知识点；
 	8. updated_methods;通methods，经过人工审核过的方法；
-	9. 
\ No newline at end of file
+	9. created_at
\ No newline at end of file