diff --git a/problems/0435.无重叠区间.md b/problems/0435.无重叠区间.md
index b24ca024..cf58b9e2 100644
--- a/problems/0435.无重叠区间.md
+++ b/problems/0435.无重叠区间.md
@@ -184,13 +184,14 @@ public:
 class Solution {
     public int eraseOverlapIntervals(int[][] intervals) {
         Arrays.sort(intervals, (a, b) -> {
-            if (a[0] == a[0]) return a[1] - b[1];
-            return a[0] - b[0];
+            // 按照区间右边界升序排序
+            return a[1] - b[1];
         });
 
         int count = 0;
         int edge = Integer.MIN_VALUE;
         for (int i = 0; i < intervals.length; i++) {
+            // 若上一个区间的右边界小于当前区间的左边界，说明无交集
             if (edge <= intervals[i][0]) {
                 edge = intervals[i][1];
             } else {