diff --git a/app/register_view.rb b/app/register_view.rb
index 12ff640..a6449d7 100644
--- a/app/register_view.rb
+++ b/app/register_view.rb
@@ -1,13 +1,13 @@
 class RegisterView
 
   include React::Component
-  required_param :registers, type: []
+  required_param :registers, type: {}
 
   def render
     div :class => :row  do
-      registers.each do |r|
+      registers.each do |r , has|
         div :class => "col-md-1" do
-          r
+          "#{r} : #{has}"
         end
       end
     end
diff --git a/lib/interpreter.rb b/lib/interpreter.rb
index 0543bad..aadf341 100644
--- a/lib/interpreter.rb
+++ b/lib/interpreter.rb
@@ -5,6 +5,6 @@ class Interpreter
   attr_accessor :registers
 
   def initialize
-    @registers = (0...12).collect{|i| "r#{i}"}
+    @registers = Hash[(0...12).collect{|i| ["r#{i}" , "undefined"]}]
   end
 end