diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index c265564..476d9f0 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,11 @@
+Release v2.0.0
+==============
+
+**Updates**
+
+* The `Tree` and `KeyValue` types are now generic. Both use a generic value
+  type `V`. This is a breaking change, so a new major release is warranted.
+
 Release v1.0.1
 ==============