Clarify that server names are at least 1 character

Fixes https://github.com/matrix-org/matrix-doc/issues/2460
4 years ago · e9998c5335
parent a1177cbd61
commit e9998c5335
1 changed files with 1 additions and 1 deletions
--- a/specification/appendices/identifier_grammar.rst
+++ b/specification/appendices/identifier_grammar.rst
@ -45,7 +45,7 @@ following grammar::
    IPv6char    = DIGIT / %x41-46 / %x61-66 / ":" / "."
                      ; 0-9, A-F, a-f, :, .

-    dns-name    = *255dns-char
+    dns-name    = 1*255dns-char

    dns-char    = DIGIT / ALPHA / "-" / "."