From a0a9e82aa753cddc81d5cf4d855eb35399e57f71 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sat, 6 Apr 2019 21:54:30 -0700
Subject: Added example with a ref link defn where the reference is never used.

Closes #454.
---
 spec.txt | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/spec.txt b/spec.txt
index 958ca64..c7dce2f 100644
--- a/spec.txt
+++ b/spec.txt
@@ -3131,6 +3131,17 @@ are defined:
 ````````````````````````````````
 
 
+Whether something is a [link reference definition] is
+independent of whether the link reference it defines is
+used in the document.  Thus, for example, the following
+document contains just a link reference definition, and
+no visible content:
+
+```````````````````````````````` example
+[foo]: /url
+.
+````````````````````````````````
+
 
 ## Paragraphs
 
-- 
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