diff --git a/README.md b/README.md
index 60a45c1..f0bc0ab 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ Linux Insides
 |├4.1||未开始|
 |├2.2||未开始|
 |├4.3||未开始|
-|├4.4|未开始|
+|├4.4||未开始|
 |Timers and time management||未开始|
 |Memory management|[@choleraehyq](http://cholerae.com)|正在进行|
 |Concepts||未开始|