diff --git a/CHANGELOG.md b/CHANGELOG.md
index 434e8d74..8600bdce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+**2.4.0**
+- add `people.union()`
+
 **2.3.5**
 - notification caching fix