diff --git a/debuggerd/proto/tombstone.proto b/debuggerd/proto/tombstone.proto
index 6f9cd96..b662d36 100644
--- a/debuggerd/proto/tombstone.proto
+++ b/debuggerd/proto/tombstone.proto
@@ -18,6 +18,8 @@
 message CrashDetail {
   bytes name = 1;
   bytes data = 2;
+
+  reserved 3 to 999;
 }
 
 message Tombstone {