diff --git a/doc/example/url.treerack b/doc/example/url.treerack
index 9ae0aa3..8e2b65f 100644
--- a/doc/example/url.treerack
+++ b/doc/example/url.treerack
@@ -43,7 +43,7 @@ ipv6-zone:failpass     = ipv6 "%25" zone-id; // RFC6874
 registry-name-rfc:failpass = (unreserved | percent-encoded | subdelimiter)*; // all RFC chars allowed
 dns-label:alias:failpass   = (alpha | digit) ("-"* (alpha | digit)+)*;
 domain-name:failpass       = dns-label ("." dns-label)* "."?; // DNS compatible
-hostname-rfc               = ipv4 | "[" (ipv6 | ipv6-zone) "]" | registry-name-rfc;
+hostname-rfc               = registry-name-rfc;
 hostname                   = ipv4 | "[" (ipv6 | ipv6-zone) "]" | domain-name;
 port                       = digit*;
 host-rfc:alias:failpass    = hostname-rfc (":" port)?;