Update changelog

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f47e362..469dde8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## Changes in 50400.20-Release:
+
+- Fixed: The arithmetic errors, hopefully
+
 ## Changes in 50400.19-Release:

 - Added: Prelimiary work on "Warlords of Draenor" raid bosses