diff --git a/tests/python/relax/test_analysis.py b/tests/python/relax/test_analysis.py
index c790b1bc5142..01588e683a9e 100644
--- a/tests/python/relax/test_analysis.py
+++ b/tests/python/relax/test_analysis.py
@@ -37,6 +37,7 @@
 
 
 def var_name_set(vars: List[Union[rx.Var, rx.GlobalVar]]) -> Set[str]:
+    """set the var name"""
     return set(map(lambda v: v.name_hint, vars))