diff --git a/lib/services/api/messages.rb b/lib/services/api/messages.rb
index f7691b3..0f9d0aa 100644
--- a/lib/services/api/messages.rb
+++ b/lib/services/api/messages.rb
@@ -36,6 +36,7 @@ class ServiceOfferingRequest < JsonMessage
         optional :timeout,      Integer
         optional :provider,     String
         optional :default_plan, String
+        optional :bs,           String
       end
 
       class ProxiedServiceOfferingRequest < JsonMessage