diff --git a/problems/0541.反转字符串II.md b/problems/0541.反转字符串II.md
index 59891365..516f78da 100644
--- a/problems/0541.反转字符串II.md
+++ b/problems/0541.反转字符串II.md
@@ -294,6 +294,8 @@ func reverseStr(s string, k int) string {
     ss := []byte(s)
     length := len(s)
     for i := 0; i < length; i += 2 * k {
+     // 1. 每隔 2k 个字符的前 k 个字符进行反转
+     // 2. 剩余字符小于 2k 但大于或等于 k 个，则反转前 k 个字符
         if i + k <= length {
             reverse(ss[i:i+k])
         } else {
@@ -326,7 +328,7 @@ javaScript:
 var reverseStr = function(s, k) {
     const len = s.length;
     let resArr = s.split(""); 
-    for(let i = 0; i < len; i += 2 * k) {
+    for(let i = 0; i < len; i += 2 * k) {  // 每隔 2k 个字符的前 k 个字符进行反转
         let l = i - 1, r = i + k > len ? len : i + k;
         while(++l < --r) [resArr[l], resArr[r]] = [resArr[r], resArr[l]];
     }