diff --git a/p2psentinel/sentinel.proto b/p2psentinel/sentinel.proto
index 52945a5..3b477bf 100644
--- a/p2psentinel/sentinel.proto
+++ b/p2psentinel/sentinel.proto
@@ -18,6 +18,7 @@ message Peer {
     string direction = 3;
     string address = 4;
     string enr = 5;
+    string agent_version = 6;
 }