diff --git a/connections/implementation/proto/offline_wire_formats.proto b/connections/implementation/proto/offline_wire_formats.proto
index 42508670..721dfd23 100644
--- a/connections/implementation/proto/offline_wire_formats.proto
+++ b/connections/implementation/proto/offline_wire_formats.proto
@@ -85,6 +85,13 @@ message ConnectionRequestFrame {
   }
   // LINT.ThenChange(//depot/google3/third_party/nearby/proto/connections_enums.proto)
 
+  // LINT.IfChange
+  enum ConnectionMode {
+    LEGACY = 0;
+    INSTANT = 1;
+  }
+  // LINT.ThenChange(//depot/google3/third_party/nearby/proto/connections_enums.proto)
+
   optional string endpoint_id = 1;
   optional string endpoint_name = 2;
   optional bytes handshake_data = 3;
@@ -109,6 +116,7 @@ message ConnectionRequestFrame {
     ConnectionsDevice connections_device = 12;
     PresenceDevice presence_device = 13;
   }
+  optional ConnectionMode connection_mode = 14;
 }
 
 message ConnectionResponseFrame {
diff --git a/proto/connections_enums.proto b/proto/connections_enums.proto
index aa7221ae..61c79837 100644
--- a/proto/connections_enums.proto
+++ b/proto/connections_enums.proto
@@ -125,6 +125,16 @@ enum ConnectionBand {
   CONNECTION_BAND_CELLULAR_BAND_5G = 7;
 }
 
+// LINT.IfChange
+enum ConnectionMode {
+  LEGACY = 0;
+  INSTANT = 1;
+}
+// LINT.ThenChange(
+//     //depot/google3/java/com/google/android/gmscore/integ/client/nearby/src/com/google/android/gms/nearby/connection/ConnectionMode.java,
+//     //depot/google3/third_party/nearby/connections/implementation/proto/offline_wire_formats.proto
+// )
+
 // The result of a ConnectionRequest.
 enum ConnectionRequestResponse {
   UNKNOWN_CONNECTION_REQUEST_RESPONSE = 0;