diff --git a/README.md b/README.md
index a8c88c9b..15852410 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ LeetCode 最强题解（持续更新中）:
 |[0059.螺旋矩阵II](https://github.com/youngyangyang04/leetcode/blob/master/problems/0059.螺旋矩阵II.md) |数组 |中等|**模拟**|
 |[0083.删除排序链表中的重复元素](https://github.com/youngyangyang04/leetcode/blob/master/problems/0083.删除排序链表中的重复元素.md) |链表 |简单|**模拟**|
 |[0142.环形链表II](https://github.com/youngyangyang04/leetcode/blob/master/problems/0142.环形链表II.md) |链表 |中等|**快慢指针/双指针**|
-|[0151.翻转字符串里的单词](https://github.com/youngyangyang04/leetcode/blob/master/problems/0151.翻转字符串里的单词.md) |字符串 |中等|**模拟**|
+|[0151.翻转字符串里的单词](https://github.com/youngyangyang04/leetcode/blob/master/problems/0151.翻转字符串里的单词.md) |字符串 |中等|**模拟/双指针**|
 |[0202.快乐数](https://github.com/youngyangyang04/leetcode/blob/master/problems/0202.快乐数.md) |哈希表 |简单|**哈希**|
 |[0203.移除链表元素](https://github.com/youngyangyang04/leetcode/blob/master/problems/0203.移除链表元素.md) |链表 |简单|**模拟** **虚拟头结点**|
 |[0205.同构字符串](https://github.com/youngyangyang04/leetcode/blob/master/problems/0205.同构字符串.md) |哈希表 |简单| **哈希**|
diff --git a/pics/151_翻转字符串里的单词.png b/pics/151_翻转字符串里的单词.png
new file mode 100644
index 00000000..dc844950
Binary files /dev/null and b/pics/151_翻转字符串里的单词.png differ
diff --git a/problems/0151.翻转字符串里的单词.md b/problems/0151.翻转字符串里的单词.md
index c5433886..22cd922e 100644
--- a/problems/0151.翻转字符串里的单词.md
+++ b/problems/0151.翻转字符串里的单词.md
@@ -48,17 +48,19 @@ public:
                 s.erase(s.begin() + i);
             }
         }
+        // 删除字符串最后面的空格
         if (s.size() > 0 && s[s.size() - 1] == ' ') {
             s.erase(s.begin() + s.size() - 1);
         }
+        // 删除字符串最前面的空格
         if (s.size() > 0 && s[0] == ' ') {
             s.erase(s.begin());
         }
     }
 
     string reverseWords(string s) {
-        reverse(s, 0, s.size() - 1); // 将字符串全部反转
         removeExtraSpaces(s); // 去掉冗余空格
+        reverse(s, 0, s.size() - 1); // 将字符串全部反转
         int start = 0;
         int end = 0;
         bool entry = false;