diff --git a/mesh.proto b/mesh.proto
index c25c95d..acf1c56 100644
--- a/mesh.proto
+++ b/mesh.proto
@@ -525,6 +525,12 @@ message Data {
    * a message a heart or poop emoji.
    */
   bool is_tapback = 8;
+
+  /*
+   * Defaults to false. If true, then what is in the payload should be treated as an emoji like giving
+   * a message a heart or poop emoji.
+   */
+   uint32 group_id = 9;
 }
 
 /*