lib/dogviz/sigma_graph_hash.rb in dogviz-0.0.18 vs lib/dogviz/sigma_graph_hash.rb in dogviz-0.0.19

@@ -16,10 +16,10 @@
 
     private
 
     def get_json_filename(type_to_filename)
       type = type_to_filename.keys.first
-      raise StandardError.new('json output only supported') unless type == :json
+      raise StandardError.new("json output only supported, not #{type}") unless type == :json
       type_to_filename[type]
     end
   end
-end
\ No newline at end of file
+end