diff --git a/lectures/22_trees_V/README.md b/lectures/22_trees_V/README.md
new file mode 100644
index 0000000..70128a4
--- /dev/null
+++ b/lectures/22_trees_V/README.md
@@ -0,0 +1,5 @@
+# Lecture 22 --- Trees, Part V
+
+Review from Lecture 21
+
+To be added.