diff --git a/归并排序.cpp b/归并排序.cpp
index 8049bd6..cee21ff 100644
--- a/归并排序.cpp
+++ b/归并排序.cpp
@@ -51,3 +51,5 @@ int main() {
 	print(a, 10);
 
 }
+时间复杂度 O(N*logN)
+归并排序的空间复杂度是O(n)