diff --git a/src/passes/LoopDetection.cpp b/src/passes/LoopDetection.cpp
index acdc58099defbae26f4b07975b85f111889f159c..93c2d2c7e0618558a28eeda9e3b5fcb531bf517e 100644
--- a/src/passes/LoopDetection.cpp
+++ b/src/passes/LoopDetection.cpp
@@ -63,7 +63,8 @@ void LoopDetection::discover_loop_and_sub_loops(BasicBlock *bb, BBset &latches,
              * 4. 建立循环嵌套关系：
              *    - 设置父循环
              *    - 添加子循环
-             * 5. 将子循环header的前驱加入工作表
+             * 5. 将子循环的所有基本快加入到父循环中
+             * 6. 将子循环header的前驱加入工作表
              */
 
         throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
diff --git a/tests/4-opt/testcases/loop/loop-1.out b/tests/4-opt/testcases/loop/loop-1.out
index 573541ac9702dd3969c9bc859d2b91ec1f7e6e56..aa47d0d46d47a06090f436b0b851b76bb6f3b6e2 100644
--- a/tests/4-opt/testcases/loop/loop-1.out
+++ b/tests/4-opt/testcases/loop/loop-1.out
@@ -1 +1,2 @@
 0
+0
diff --git a/tests/4-opt/testcases/loop/loop-2.out b/tests/4-opt/testcases/loop/loop-2.out
index d00491fd7e5bb6fa28c517a0bb32b8b506539d4d..b261da18d51a39dc2cf0d156791e9c0b35dd83f4 100644
--- a/tests/4-opt/testcases/loop/loop-2.out
+++ b/tests/4-opt/testcases/loop/loop-2.out
@@ -1 +1,2 @@
 1
+0
diff --git a/tests/4-opt/testcases/loop/loop-3.out b/tests/4-opt/testcases/loop/loop-3.out
index d00491fd7e5bb6fa28c517a0bb32b8b506539d4d..b261da18d51a39dc2cf0d156791e9c0b35dd83f4 100644
--- a/tests/4-opt/testcases/loop/loop-3.out
+++ b/tests/4-opt/testcases/loop/loop-3.out
@@ -1 +1,2 @@
 1
+0
diff --git a/tests/4-opt/testcases/loop/loop-4.out b/tests/4-opt/testcases/loop/loop-4.out
index d00491fd7e5bb6fa28c517a0bb32b8b506539d4d..b261da18d51a39dc2cf0d156791e9c0b35dd83f4 100644
--- a/tests/4-opt/testcases/loop/loop-4.out
+++ b/tests/4-opt/testcases/loop/loop-4.out
@@ -1 +1,2 @@
 1
+0