diff --git a/Chinese version of TRON Protocol document.md b/Chinese version of TRON Protocol document.md
index 283bd5fb8..f393447e4 100644
--- a/Chinese version of TRON Protocol document.md	
+++ b/Chinese version of TRON Protocol document.md	
@@ -442,7 +442,7 @@
    `TOO_MANY_PEERS`  
    `DUPLICATE_PEER`  
    `INCOMPATIBLE_PROTOCOL`  
-   `NULL_IDENTITY`  
+   `RANDOM_ELIMINATION`  
    `PEER_QUITING`  
    `UNEXPECTED_IDENTITY`  
    `LOCAL_IDENTITY`  
@@ -459,7 +459,7 @@
         TOO_MANY_PEERS = 4;
         DUPLICATE_PEER = 5;
         INCOMPATIBLE_PROTOCOL = 6;
-        NULL_IDENTITY = 7;
+        RANDOM_ELIMINATION = 7;
         PEER_QUITING = 8;
         UNEXPECTED_IDENTITY = 9;
         LOCAL_IDENTITY = 10;
diff --git a/English version of TRON Protocol document.md b/English version of TRON Protocol document.md
index e282f4b0a..5b1b5d1f0 100644
--- a/English version of TRON Protocol document.md	
+++ b/English version of TRON Protocol document.md	
@@ -458,7 +458,7 @@ Input, transaction and head block all require signature.
      `TOO_MANY_PEERS`  
      `DUPLICATE_PEER`  
      `INCOMPATIBLE_PROTOCOL`  
-     `NULL_IDENTITY`  
+     `RANDOM_ELIMINATION`  
      `PEER_QUITING`  
      `UNEXPECTED_IDENTITY`  
      `LOCAL_IDENTITY`  
@@ -475,7 +475,7 @@ Input, transaction and head block all require signature.
           TOO_MANY_PEERS = 4;
           DUPLICATE_PEER = 5;
           INCOMPATIBLE_PROTOCOL = 6;
-          NULL_IDENTITY = 7;
+          RANDOM_ELIMINATION = 7;
           PEER_QUITING = 8;
           UNEXPECTED_IDENTITY = 9;
           LOCAL_IDENTITY = 10;
diff --git a/core/Discover.proto b/core/Discover.proto
index 4cc0d83b0..fadb819e9 100644
--- a/core/Discover.proto
+++ b/core/Discover.proto
@@ -11,6 +11,7 @@ message Endpoint {
   bytes address = 1;
   int32 port = 2;
   bytes nodeId = 3;
+  bytes addressIpv6 = 4;
 }
 
 message PingMessage {