diff --git a/site.mk b/site.mk
index 16f8e0d..a3d622a 100644
--- a/site.mk
+++ b/site.mk
@@ -35,4 +35,7 @@ GLUON_RELEASE ?= $(DEFAULT_GLUON_RELEASE)
 
 GLUON_PRIORITY ?= 0
 
+# Region code required for some images; supported values: us eu
+GLUON_REGION ?= eu
+
 GLUON_LANGS ?= en de