diff --git a/docs/chapter_computational_complexity/time_complexity.md b/docs/chapter_computational_complexity/time_complexity.md
index 4328dc6b3..22dc3472a 100644
--- a/docs/chapter_computational_complexity/time_complexity.md
+++ b/docs/chapter_computational_complexity/time_complexity.md
@@ -786,6 +786,7 @@ $$
 === "TypeScript"
 
     ```typescript title="time_complexity.ts"
+    /* 常数阶 */
     function constant(n: number): number {
         let count = 0;
         const size = 100000;