diff --git a/CHANGELOG b/CHANGELOG
index 29cd016..649b8e3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,5 @@
 3.0
+- By default relations are saved as json. This allows to keep the type
 - Dates can no longer be added or subtracted
 - Types are now inferred by column, no longer by cell
 - Relations now use frozenset internally and are immutable