diff --git a/libp2p/security/secure_conn_interface.py b/libp2p/security/secure_conn_interface.py
index 946d4f5..3b5bb5c 100644
--- a/libp2p/security/secure_conn_interface.py
+++ b/libp2p/security/secure_conn_interface.py
@@ -14,6 +14,7 @@ class ISecureConn(ABC):
         :return: connection object that has been made secure
         """
 
+    @abstractmethod
     def get_security_details(self):
         """
         :return: map containing details about the connections security
diff --git a/libp2p/transport/upgrader.py b/libp2p/transport/upgrader.py
index 9e311e3..f84fb40 100644
--- a/libp2p/transport/upgrader.py
+++ b/libp2p/transport/upgrader.py
@@ -10,16 +10,19 @@ class TransportUpgrader:
 
     def upgrade_listener(self, transport, listeners):
         """
-        upgrade multiaddr listeners to libp2p-transport listeners
-
+        Upgrade multiaddr listeners to libp2p-transport listeners
         """
 
-    def upgrade_security(self):
+    def upgrade_security(self, conn, peer_id):
+        """
+        Upgrade conn to be a secured connection
+        """
+        # TODO: Do exchange to determine security module
         pass
 
     def upgrade_connection(self, conn, generic_protocol_handler, peer_id):
         """
-        upgrade raw connection to muxed connection
+        Upgrade raw connection to muxed connection
         """
 
         # For PoC, no security, default to mplex