diff --git a/p2psentinel/sentinel.proto b/p2psentinel/sentinel.proto
index 57634da..5bb438a 100644
--- a/p2psentinel/sentinel.proto
+++ b/p2psentinel/sentinel.proto
@@ -10,6 +10,7 @@ message EmptyMessage {}
 
 message SubscriptionData {
     optional string filter = 1;
+    repeated string topics = 2;
 }
 
 message Peer {
@@ -45,6 +46,17 @@ message ResponseData {
     Peer peer = 3;
 }
 
+message EnrEntry {
+    string key = 1; // the key of the data
+    bool remove = 2; // if set, remove this entry instead of updating.
+    bytes data = 3; // rlp compatible enr data
+}
+
+message NodeData {
+    bytes NodeId = 1; // 32 byte node id
+}
+
+
 service Sentinel {
     rpc SubscribeGossip(SubscriptionData) returns (stream GossipData);
     rpc SendRequest(RequestData) returns (ResponseData);
@@ -55,4 +67,6 @@ service Sentinel {
     rpc PenalizePeer(Peer) returns(EmptyMessage);
     rpc RewardPeer(Peer) returns(EmptyMessage);
     rpc PublishGossip(GossipData) returns(EmptyMessage);
+    rpc UpdateEnr(EnrEntry) returns(EmptyMessage);
+    rpc GetNodeInfo(EmptyMessage) returns (NodeData);
 }