diff --git a/React 的源码深入/React 的流程解析 - commit 阶段/React 的流程解析 - commit阶段.md b/React 的源码深入/React 的流程解析 - commit 阶段/React 的流程解析 - commit阶段.md
index 24d4c90..b94ae07 100644
--- a/React 的源码深入/React 的流程解析 - commit 阶段/React 的流程解析 - commit阶段.md	
+++ b/React 的源码深入/React 的流程解析 - commit 阶段/React 的流程解析 - commit阶段.md	
@@ -28,4 +28,19 @@ root.finishedLanes = NoLanes;
 
 root.callbackNode = null;
 root.callbackPriority = NoLane;
+
+// 内部位运算
+var remainingLanes = mergeLanes(
+	finishedWork.lanes,
+	finishedWork.childLanes
+);
+
+// 内部也是位运算
+markRootFinished(root, remainingLanes);
+
+if (root === workInProgressRoot) {
+	workInProgressRoot = null;
+	workInProgress = null;
+	workInProgressRootRenderLanes = NoLanes;
+}
 ```
\ No newline at end of file