diff --git a/assets/section_3.1_1686980736370_0.edn b/assets/section_3.1_1686980736370_0.edn
index ab9a38b..199a9b0 100644
--- a/assets/section_3.1_1686980736370_0.edn
+++ b/assets/section_3.1_1686980736370_0.edn
@@ -1 +1 @@
-{:highlights [], :extra {:page 1}}
+{:highlights [], :extra {:page 4}}
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 19f712d..ecd11bb 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2864,7 +2864,8 @@
 				  :LOGBOOK:
 				  CLOCK: [2023-06-17 Sat 13:49:57]
 				  :END:
-					- ![section 3.1.pdf](../assets/section_3.1_1686980736370_0.pdf)
+					- Random vectors ![section 3.1.pdf](../assets/section_3.1_1686980736370_0.pdf)
+						- Random Vectors and joint distributions
 			- LATER 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01