diff --git a/specs/phase0/p2p-interface.md b/specs/phase0/p2p-interface.md
index 69ff7e120..297d93948 100644
--- a/specs/phase0/p2p-interface.md
+++ b/specs/phase0/p2p-interface.md
@@ -567,6 +567,8 @@ The response code can have one of the following values, encoded as a single unsi
   The response payload adheres to the `ErrorMessage` schema (described below).
 -  2: **ServerError** -- the responder encountered an error while processing the request.
   The response payload adheres to the `ErrorMessage` schema (described below).
+-  3: **ResourceUnavailable** -- the responder does not have requested resource.
+  The response payload adheres to the `ErrorMessage` schema (described below).
 
 Clients MAY use response codes above `128` to indicate alternative, erroneous request-specific responses.