diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9dcdc6ca..72ebb4f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 * Add: [sharing] conversion_bday_categories (customize)
 * Add: [sharing] conversion_bday_age_max (limit in case of "age" placeholder is used which blocks using RRULE)
 * Extension: [sharing/bday conversion]: add STATUS + CLASS fields
+* Improve: sanitize item add timezone to EXDATE or RDATE if missing but DTSTART has
 
 ## 3.7.4
 * Fix: sharing: PROPFIND returns now empty owner element in case of a mapped share as clients try PROPFIND on this not accessable href