diff --git a/lectures/19_trees_II/README.md b/lectures/19_trees_II/README.md
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--- a/lectures/19_trees_II/README.md
+++ b/lectures/19_trees_II/README.md
@@ -1,4 +1,5 @@
 # Lecture 18 --- Trees, Part II
+## Announcements
 
 ## Review from Lecture 17