diff --git a/CHANGELOG.md b/CHANGELOG.md
index a5e28129422ffc1d536360c0aae61a8b320da4fb..e3954f8241932adc89002d22fd935092d87add95 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## Version ??? - soon
 
 - Changed planning break from midnight to 4am
+- Make slot start field non-nullable to simplify code
 
 ## Version 1.2.1 - 2021-04-24