diff --git a/rend-spec-v3.txt b/rend-spec-v3.txt
index d1f7618..4ba88d7 100644
--- a/rend-spec-v3.txt
+++ b/rend-spec-v3.txt
@@ -240,7 +240,8 @@ Table of contents:
    Link specifier types are as described in tor-spec.txt. Every set of
    link specifiers SHOULD include at minimum specifiers of type [00]
    (TLS-over-TCP, IPv4), [02] (legacy node identity) and [03] (ed25519
-   identity key).
+   identity key).  Sets of link specifiers without these three types
+   SHOULD be rejected.
 
    As of 0.4.1.1-alpha, Tor includes both IPv4 and IPv6 link specifiers
    in v3 onion service protocol link specifier lists. All available