add OpenStreetMap attribution

kofemann · kofemann · commit cbfcf236a105 · 2026-04-10T16:54:50.000+02:00
diff --git a/content/about.md b/content/about.md
@@ -20,6 +20,7 @@ As an open source project, dCache welcomes community contributions. It uses the
 ### Map of dCache installations around the world
 
 ![dcache map][dcache-map]
+© OpenStreetMap contributors
 
 ### Project status
 
