diff --git a/models.proto b/models.proto
index 7afe695..ef20f0c 100644
--- a/models.proto
+++ b/models.proto
@@ -1274,4 +1274,9 @@ message MembershipTierData {
     // Android platform-specific data:
     string androidProductId = 17;
     string androidManageUrl = 18;
+}
+
+message Detail {
+    string key = 1;
+    google.protobuf.Value value = 2; // NUll - removes key
 }
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