diff --git a/protob/messages-cardano.proto b/protob/messages-cardano.proto
index 8962210f4..8aa2d0b89 100644
--- a/protob/messages-cardano.proto
+++ b/protob/messages-cardano.proto
@@ -34,6 +34,7 @@ message CardanoAddress {
  */
 message CardanoGetPublicKey {
     repeated uint32 address_n = 1;  // BIP-32 path to derive the key from master node
+    optional bool show_display = 2; // optionally show on display before sending the result
 }
 
 /**