diff --git a/CHANGELOG.md b/CHANGELOG.md
index 943ba2a5..db197f24 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,7 @@
-# Next Release (Tentatively 0.3.5) - TBD
+# Next Release (Tentatively 0.4) - TBD
+
+- Added a new bignum type to support exact integers of practically unlimited size.
+- As part of the bignum changes, modified the code for exact integer arithmetic to detect overflow.
 
 # 0.3.4 - February 10, 2017