diff --git a/docs/chapter_computational_complexity/time_complexity.md b/docs/chapter_computational_complexity/time_complexity.md
index e567718a..b3dc3c35 100644
--- a/docs/chapter_computational_complexity/time_complexity.md
+++ b/docs/chapter_computational_complexity/time_complexity.md
@@ -79,6 +79,7 @@ $$
 === "JavaScript"
 
     ```js title=""
+    // 在某运行平台下
     function algorithm(n) {
         var a = 2; // 1 ns
         a = a + 1; // 1 ns