Update prototype_distribution.md

en/prototype_distribution.md

@@ -34,6 +34,6 @@ Your Card10logix team
 * share your research in the card10logix wiki, matrix/irc and @card10badge
 
 ## Cities that already have ambassadors
-* Berlin
+* Berlin: 2 prototypes, bi-weekly meeting at the [xHain](https://x-hain.de); ambassador: miriamino contact via matrix/irc chat)
 * Munich
 * Bremen: location: ccchb; ambassador: lilafisch (contact via card10 matrix/irc chat, in [ccchb irc](http://ccchb.de/wiki/Chat))
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