diff --git a/calendar_specification.json b/calendar_specification.json
new file mode 100644
index 0000000..52947c0
--- /dev/null
+++ b/calendar_specification.json
@@ -0,0 +1,18 @@
+{
+  "x-file-description-for-humans": "This is a calendar specification for an aggregated ChaosZone calendar. It uses this software: https://github.com/niccokunzmann/open-web-calendar",
+  "x-specification-url": "https://github.com/Chaostreff-Potsdam/Chaostreff-Potsdam.github.io/raw/master/calendar_specification.json",
+    "url": [
+        "https://kalender.eigenbaukombinat.de/public/public.ics",
+        "https://dezentrale.space/?plugin=all-in-one-event-calendar&controller=ai1ec_exporter_controller&action=export_events&no_html=true",
+        "http://api.service.z-labor.space/spaceapi.json",
+        "https://www.c3d2.de/hq.ics",
+        "http://chaoschemnitz.de/chch.ical",
+        "https://open-web-calendar.herokuapp.com/calendar.ics?specification_url=https://github.com/Chaostreff-Potsdam/Chaostreff-Potsdam.github.io/blob/master/calendar-specification.json",
+        "https://calendar.google.com/calendar/ical/2eskb61g20prl65k2qd01uktis%40group.calendar.google.com/public/basic.ics"
+    ],
+    "title": "ChaosZone-Kalender",
+    "language": "de",
+    "skin": "dhtmlxscheduler_contrast_black.css",
+    "css": "a {color: white;}",
+    "description": "Das ist ein gemeinsamer Kalender der ChaosZone. Unten kannst du den ICS-Link benutzen, um die Termine zu abbonieren."
+}