diff --git a/typed-racket-lib/typed-racket/HISTORY.txt b/typed-racket-lib/typed-racket/HISTORY.txt
index 559fa6f3..4dc12118 100644
--- a/typed-racket-lib/typed-racket/HISTORY.txt
+++ b/typed-racket-lib/typed-racket/HISTORY.txt
@@ -1,3 +1,6 @@
+6.10
+- Improve refinement types.
+- Split mutable and immutable hash types.
 6.9
 - Added initial steps towards refinement types.
 - Fixes related to numeric types and NaN.