diff --git a/IT-Infra-Services/Kalender.md b/IT-Infra-Services/Kalender.md
index bedc180..6812338 100644
--- a/IT-Infra-Services/Kalender.md
+++ b/IT-Infra-Services/Kalender.md
@@ -28,3 +28,7 @@ https://mail.flipdot.org/SOGo/dav/public/com@flipdot.org/Calendar/41-64A05800-5-
 ## Internal
 - authenticated
 https://mail.flipdot.org/SOGo/dav/com@flipdot.org/Calendar/3C-64A05800-3F-363423C0/
+- public CalDAV-URL
+https://mail.flipdot.org/SOGo/dav/public/com@flipdot.org/Calendar/3C-64A05800-3F-363423C0/
+- public CALDAV-ICS-URL
+https://mail.flipdot.org/SOGo/dav/public/com@flipdot.org/Calendar/3C-64A05800-3F-363423C0.ics