diff --git a/types/types.proto b/types/types.proto
index d1f27eae3..20101305b 100644
--- a/types/types.proto
+++ b/types/types.proto
@@ -229,6 +229,9 @@ message Header {
   // hashes
   bytes last_block_hash = 6;
   bytes app_hash = 7;
+
+  // consensus
+  RequestValidator proposer = 8;
 }
 
 // Validator for use in responses