diff --git a/waku/standards/core/13/store.md b/waku/standards/core/13/store.md
index 7214dc0..2f4e325 100644
--- a/waku/standards/core/13/store.md
+++ b/waku/standards/core/13/store.md
@@ -105,6 +105,8 @@ message HistoryResponse {
   enum Error {
     NONE = 0;
     INVALID_CURSOR = 1;
+    TOO_MANY_REQUESTS = 429;
+    SERVICE_UNAVAILABLE = 503;
   }
   Error error = 4;
 }