diff --git a/README.md b/README.md
index eb6b36e..4b7b75d 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,7 @@
 |├ [6.1](https://github.com/MintCN/linux-insides-zh/blob/master/SyncPrim/linux-sync-1.md)|[@keltoy](https://github.com/keltoy)|已完成|
 |├ [6.2](https://github.com/MintCN/linux-insides-zh/blob/master/SyncPrim/linux-sync-2.md)|[@keltoy](https://github.com/keltoy)|已完成|
 |├ [6.3](https://github.com/MintCN/linux-insides-zh/blob/master/SyncPrim/linux-sync-3.md)|[@huxq](https://github.com/huxq)|已完成|
-|├ [6.4](https://github.com/MintCN/linux-insides-zh/blob/master/SyncPrim/linux-sync-4.md)||未开始|
+|├ [6.4](https://github.com/MintCN/linux-insides-zh/blob/master/SyncPrim/linux-sync-4.md)|[@nannxnann](https://github.com/nannxnann)|正在进行|
 |├ [6.5](https://github.com/MintCN/linux-insides-zh/blob/master/SyncPrim/linux-sync-5.md)||未开始|
 |└ [6.6](https://github.com/MintCN/linux-insides-zh/blob/master/SyncPrim/linux-sync-6.md)||未开始|
 | 7. [Memory management](https://github.com/MintCN/linux-insides-zh/tree/master/MM)||未开始|