diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79f2ed97e..6b2a2ce02 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ IMPROVEMENTS:
 
   - core: Added `config.vm.box_server_url` setting to point at a
      Vagrant Cloud instance. [GH-4282]
+  - core: File checksumming performance has been improved by at least
+      100%. Memory requirements have gone down by half. [GH-4090]
   - guests/nixos: Added better NFS support. [GH-3983]
   - providers/hyperv: Accept VHD disk format. [GH-4208]