diff --git a/apps/ndn-producer.h b/apps/ndn-producer.h
index 42f65aa..8349ea2 100644
--- a/apps/ndn-producer.h
+++ b/apps/ndn-producer.h
@@ -41,10 +41,10 @@
  */
 class Producer : public App
 {
-public: 
+public:
   static TypeId
   GetTypeId (void);
-        
+
   Producer ();
 
   // inherited from NdnApp
@@ -63,6 +63,9 @@
   Name m_postfix;
   uint32_t m_virtualPayloadSize;
   Time m_freshness;
+
+  uint32_t m_signature;
+  Name m_keyLocator;
 };
 
 } // namespace ndn