diff --git a/problems/0216.组合总和III.md b/problems/0216.组合总和III.md
index a411117c..26c630b9 100644
--- a/problems/0216.组合总和III.md
+++ b/problems/0216.组合总和III.md
@@ -462,7 +462,7 @@ int** combinationSum3(int k, int n, int* returnSize, int** returnColumnSizes){
 func combinationSum3(_ count: Int, _ targetSum: Int) -> [[Int]] {
     var result = [[Int]]()
     var path = [Int]()
-    func backtracking(sum: Int, startIndex: Int) {
+    func backtracking(sum: Int, start: Int) {
         // 剪枝
         if sum > targetSum { return }
         // 终止条件
@@ -474,16 +474,16 @@ func combinationSum3(_ count: Int, _ targetSum: Int) -> [[Int]] {
         }
 
         // 单层逻辑
-        let endIndex = 9
-        guard startIndex <= endIndex else { return }
-        for i in startIndex ... endIndex {
+        let end = 9
+        guard start <= end else { return }
+        for i in start ... end {
             path.append(i) // 处理
-            backtracking(sum: sum + i, startIndex: i + 1)
+            backtracking(sum: sum + i, start: i + 1)
             path.removeLast() // 回溯
         }
     }
 
-    backtracking(sum: 0, startIndex: 1)
+    backtracking(sum: 0, start: 1)
     return result
 }
 ```