From 27ad6bf2124fa972d4b29303a1f817cdfde00857 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@oriontransfer.co.nz>
Date: Tue, 19 May 2020 16:31:40 +1200
Subject: [PATCH] Allow optional namespace before tag name.

---
 spec.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/spec.txt b/spec.txt
index c62df5bb..531a7fcf 100644
--- a/spec.txt
+++ b/spec.txt
@@ -8914,6 +8914,10 @@ so custom tags (and even, say, DocBook tags) may be used.
 
 Here is the grammar for tags:
 
+An optional [namespace](@) consists of an ASCII letter
+followed by zero or more ASCII letters, digits, or
+hyphens (`-`), ending with a colon (`:`).
+
 A [tag name](@) consists of an ASCII letter
 followed by zero or more ASCII letters, digits, or
 hyphens (`-`).