diff --git a/assets/section_2.3_1686916498071_0.edn b/assets/section_2.3_1686916498071_0.edn
index 5d9ecfe..f89eac4 100644
--- a/assets/section_2.3_1686916498071_0.edn
+++ b/assets/section_2.3_1686916498071_0.edn
@@ -1 +1,13 @@
-{:highlights [], :extra {:page 3}}
+{:highlights [{:id #uuid "648c4e9e-5515-4da3-bc6b-39d6969f5f14",
+               :page 6,
+               :position {:bounding {:x1 36,
+                                     :y1 52.583251953125,
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+                          :rects (),
+                          :page 6},
+               :content {:text "[:span]", :image 1686916764282},
+               :properties {:color "yellow"}}],
+ :extra {:page 11}}
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diff --git a/pages/hls__section_2.3_1686916498071_0.md b/pages/hls__section_2.3_1686916498071_0.md
new file mode 100644
index 0000000..fdaa23c
--- /dev/null
+++ b/pages/hls__section_2.3_1686916498071_0.md
@@ -0,0 +1,10 @@
+file:: [section_2.3_1686916498071_0.pdf](../assets/section_2.3_1686916498071_0.pdf)
+file-path:: ../assets/section_2.3_1686916498071_0.pdf
+
+- [:span]
+  ls-type:: annotation
+  hl-page:: 6
+  hl-color:: yellow
+  id:: 648c4e9e-5515-4da3-bc6b-39d6969f5f14
+  hl-type:: area
+  hl-stamp:: 1686916764282
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 8060766..451411d 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2719,6 +2719,8 @@
 							- ((648c48ac-76be-4848-af0d-1532467c8d68))
 					- Mathematical Expectation and Variance ![section 2.3.pdf](../assets/section_2.3_1686916498071_0.pdf)
 						- Expectation
+							- ((648c4e9e-5515-4da3-bc6b-39d6969f5f14))
+							-
 			- LATER 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01