diff --git a/assets/section_3.1_1686980736370_0.edn b/assets/section_3.1_1686980736370_0.edn
index c6ef9e0..ed96223 100644
--- a/assets/section_3.1_1686980736370_0.edn
+++ b/assets/section_3.1_1686980736370_0.edn
@@ -69,5 +69,29 @@
                           :rects (),
                           :page 14},
                :content {:text "[:span]", :image 1686982400841},
+               :properties {:color "yellow"}}
+              {:id #uuid "648d4f45-89ee-420b-9b93-13076e232dff",
+               :page 15,
+               :position {:bounding {:x1 52,
+                                     :y1 58.99951171875,
+                                     :x2 681,
+                                     :y2 511.99951171875,
+                                     :width 725.67,
+                                     :height 544.252},
+                          :rects (),
+                          :page 15},
+               :content {:text "[:span]", :image 1686982468780},
+               :properties {:color "yellow"}}
+              {:id #uuid "648d4f55-569b-404b-a473-6f155efb0dda",
+               :page 16,
+               :position {:bounding {:x1 48,
+                                     :y1 73.16650390625,
+                                     :x2 693,
+                                     :y2 490.16650390625,
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+                                     :height 544.252},
+                          :rects (),
+                          :page 16},
+               :content {:text "[:span]", :image 1686982484555},
                :properties {:color "yellow"}}],
- :extra {:page 15}}
+ :extra {:page 17}}
diff --git a/assets/section_3.1_1686980736370_0/15_648d4f45-89ee-420b-9b93-13076e232dff_1686982468780.png b/assets/section_3.1_1686980736370_0/15_648d4f45-89ee-420b-9b93-13076e232dff_1686982468780.png
new file mode 100644
index 0000000..e4acc98
Binary files /dev/null and b/assets/section_3.1_1686980736370_0/15_648d4f45-89ee-420b-9b93-13076e232dff_1686982468780.png differ
diff --git a/assets/section_3.1_1686980736370_0/16_648d4f55-569b-404b-a473-6f155efb0dda_1686982484555.png b/assets/section_3.1_1686980736370_0/16_648d4f55-569b-404b-a473-6f155efb0dda_1686982484555.png
new file mode 100644
index 0000000..dee0a60
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diff --git a/pages/hls__section_3.1_1686980736370_0.md b/pages/hls__section_3.1_1686980736370_0.md
index 5eee3f3..13cfffa 100644
--- a/pages/hls__section_3.1_1686980736370_0.md
+++ b/pages/hls__section_3.1_1686980736370_0.md
@@ -42,4 +42,18 @@ file-path:: ../assets/section_3.1_1686980736370_0.pdf
   hl-color:: yellow
   id:: 648d4f01-6942-43ea-b5a1-159b99d49d7a
   hl-type:: area
-  hl-stamp:: 1686982400841
\ No newline at end of file
+  hl-stamp:: 1686982400841
+- [:span]
+  ls-type:: annotation
+  hl-page:: 15
+  hl-color:: yellow
+  id:: 648d4f45-89ee-420b-9b93-13076e232dff
+  hl-type:: area
+  hl-stamp:: 1686982468780
+- [:span]
+  ls-type:: annotation
+  hl-page:: 16
+  hl-color:: yellow
+  id:: 648d4f55-569b-404b-a473-6f155efb0dda
+  hl-type:: area
+  hl-stamp:: 1686982484555
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index f577180..092c20e 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2880,7 +2880,9 @@
 								  collapsed:: true
 									- ((648d4dd7-6ecc-479d-bd1e-0280c9bb7155))
 						- Discrete random vectors
-							- JPF :-> ((648d4f01-6942-43ea-b5a1-159b99d49d7a))
+							- JPF : ((648d4f01-6942-43ea-b5a1-159b99d49d7a))
+							- Marginal p.f. : ((648d4f45-89ee-420b-9b93-13076e232dff))
+							- ((648d4f55-569b-404b-a473-6f155efb0dda))
 							-
 			- LATER 学积分
 			  :LOGBOOK: