diff --git a/QGIS-Hackfest---Essen-April-2017.md b/QGIS-Hackfest---Essen-April-2017.md
index 1a9a4b0..48f4ced 100644
--- a/QGIS-Hackfest---Essen-April-2017.md
+++ b/QGIS-Hackfest---Essen-April-2017.md
@@ -27,7 +27,9 @@ Map: http://www.openstreetmap.org/?lat=51.43&lon=7.11&mlat=51.43011&mlon=7.11273
 ## Sponsors
 
 * The Linuxhotel in Essen will provide the venue, accommodation, drinks, etc at very reasonable conditions.
-* Geoinformatikbüro Dassau located in Dusseldorf will help organizing the developer meeting
+* FOSSGIS e.V. (German OSGeo chapter)
+* QGIS-DE e.V. (German QGIS User Association)
+* Geoinformatikbüro Dassau GmbH located in Dusseldorf will help organizing the developer meeting
 
 ## Program