diff --git a/notes/数据库系统原理.md b/notes/数据库系统原理.md
index 4aaa9044..d7e3d8d6 100644
--- a/notes/数据库系统原理.md
+++ b/notes/数据库系统原理.md
@@ -25,7 +25,7 @@
     * [快照读与当前读](#快照读与当前读)
 * [六、Next-Key Locks](#六next-key-locks)
     * [Record Locks](#record-locks)
-    * [Grap Locks](#grap-locks)
+    * [Gap Locks](#gap-locks)
     * [Next-Key Locks](#next-key-locks)
 * [七、关系数据库设计理论](#七关系数据库设计理论)
     * [函数依赖](#函数依赖)