diff --git a/159-7.py b/159-7.py
index 0555e94..096c692 100644
--- a/159-7.py
+++ b/159-7.py
@@ -33,5 +33,5 @@ def GetNthRoot(a,n):
     return x1
 
 if __name__ == "__main__":
-    re = GetNthRoot(30, 5)
+    re = GetNthRoot(30, 5)   #30的5次方根###########################
     print(re)
\ No newline at end of file