diff --git a/tests/system-test/2-query/function_elapsed.py b/tests/system-test/2-query/function_elapsed.py
index 9ef30eaaa0db74c8b8a1b410496d9d673606880e..d257e003a6d862d4991897772e064d234fbf125b 100644
--- a/tests/system-test/2-query/function_elapsed.py
+++ b/tests/system-test/2-query/function_elapsed.py
@@ -30,6 +30,8 @@ class TDTestCase:
     def caseDescription(self):
 
         '''
+        case1 <wenzhouwww>: [TD-11804]  test case for elapsed function : 
+        
         this test case is for aggregate function elapsed , elapsed function can only used for the timestamp primary key column (ts) , 
         it has two input parameters,  the first parameter is necessary, basic SQL as follow: