diff --git a/src/teaching/cse-250/2022fa/index.erb b/src/teaching/cse-250/2022fa/index.erb
index 02e98bbf..c5badd78 100644
--- a/src/teaching/cse-250/2022fa/index.erb
+++ b/src/teaching/cse-250/2022fa/index.erb
@@ -392,6 +392,8 @@ schedule:
     - date: 10/28/22
       topic: Binary Search Trees, Tree Iteration
       dow: Fri
+      section_a:
+        slides: slide/lec25a.pdf
       section_b:
         slides: slide/24b-BalancingTrees.pdf
   - week: 10
diff --git a/src/teaching/cse-250/2022fa/slide/lec25a.pdf b/src/teaching/cse-250/2022fa/slide/lec25a.pdf
new file mode 100644
index 00000000..379cb8e0
Binary files /dev/null and b/src/teaching/cse-250/2022fa/slide/lec25a.pdf differ