diff --git a/chat_networking.hpp b/chat_networking.hpp
index 902204b..0114ccf 100644
--- a/chat_networking.hpp
+++ b/chat_networking.hpp
@@ -1,6 +1,7 @@
 #pragma once
 #include <iostream>
 #include <string>
+#include <vector>
 #include <functional>
 #include <boost/asio.hpp>
 #include <algorithm>
@@ -39,6 +40,7 @@ namespace chat
         std::ostream _os;//--------'
 
         std::string _login;
+        std::vector<std::function<void(chat_message)>> _subscriptions;
 
 
     /* interface */
@@ -74,6 +76,9 @@ namespace chat
                       });
         }
 
+        void subscribe(std::function<void(chat_message)> callback)
+        { _subscriptions.push_back(std::move(callback)); }
+
 
     /* internal methods */
     private:
@@ -143,6 +148,7 @@ namespace chat
 
                          char header = data[0];                         // get command byte
                          auto content = data.substr(1, data.size()-1);  // minus command & term bytes
+                         chat_message msg(static_cast<message>(header), content);
 
                          switch (header)                                // decide what to do
                          {
@@ -167,6 +173,9 @@ namespace chat
                                  break;
                          }
 
+                         for (auto& fun : _subscriptions)               // notify subscribers
+                             fun(msg);
+
                          receive();                                     // receive the next message
                      });
         }