diff --git a/CHANGELOG.md b/CHANGELOG.md
index af0fcb86..75a6be09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,7 +21,9 @@ will consitute of a breaking change warranting a new major release:
 
 ## Added
 
-- 
+- The `CoreController` now sets the leap seconds on initalization. They are stored in a persistent
+  file. If the file does yet not exist, it will be created. The leap seconds can be updated using an
+  action command. This will also update the file.
 
 ## Fixed