diff --git a/problems/0039.组合总和.md b/problems/0039.组合总和.md
index 564d13ea..54e9f2e5 100644
--- a/problems/0039.组合总和.md
+++ b/problems/0039.组合总和.md
@@ -291,7 +291,7 @@ class Solution:
         for i in range(start_index, len(candidates)):
             sum_ += candidates[i]
             self.path.append(candidates[i])
-            self.backtracking(candidates, target, sum_, i)  # 因为无限制重复选取，所以不是i-1
+            self.backtracking(candidates, target, sum_, i)  # 因为无限制重复选取，所以不是i+1
             sum_ -= candidates[i]   # 回溯
             self.path.pop()        # 回溯
 ```