diff --git a/mini-lsm-book/src/week3-06-serializable.md b/mini-lsm-book/src/week3-06-serializable.md
index 0d047f9..2d7e75a 100644
--- a/mini-lsm-book/src/week3-06-serializable.md
+++ b/mini-lsm-book/src/week3-06-serializable.md
@@ -1,5 +1,7 @@
-# Serializable Snapshot Isolation
+# Snapshot Isolation and Serializable Snapshot Isolation
 
-## Task 1: Record Read Set and Write Set
+## Task 1: Snapshot Isolation: Detect Write-Write Conflict
 
-## Task 2: Serializable Verification
+## Task 2: Serializable: Record Read Set and Write Set
+
+## Task 3: Serializable Verification