diff --git a/editions/tw5.com/tiddlers/wikitext/Linking in WikiText.tid b/editions/tw5.com/tiddlers/wikitext/Linking in WikiText.tid
index 9d6a4d15a..ab015ad43 100644
--- a/editions/tw5.com/tiddlers/wikitext/Linking in WikiText.tid	
+++ b/editions/tw5.com/tiddlers/wikitext/Linking in WikiText.tid	
@@ -32,21 +32,37 @@ You can suppress a link from being recognised by preceding it with `~`. For exam
 
 ! External Links
 
-To link to an external website, type the full URL of the site:
+To link to an external [[resource|https://en.wikipedia.org/wiki/Web_resource]] such as a website or a file, type its //full// [[URL|https://en.wikipedia.org/wiki/URL]], including the [[URI scheme|https://en.wikipedia.org/wiki/URI_scheme]] such as a protocol (e.g. `http://`, `file://`) or `mailto`:
 
 ```
 http://tiddlywiki.com/
 
 [[TW5|http://tiddlywiki.com/]]
+
+[[Mail me|mailto:me@where.net]]
 ```
 
-For this syntax to work, the URL has to be recognisable as an URL, including a protocol such as `http://` or `file://`. You can force an external link with the extended syntax:
+For this syntax to work, the URL has to be recognisable as a URL.  Otherwise, it is treated as a tiddler title.  As a result, in case you want to link to a resource locatable using a relative path, use the extended syntax:
+
+```
+[ext[Open file|index.html]]
+
+[ext[Open file|./index.html]]
+
+[ext[Open file|../README.md]]
+```
+
+The extended syntax still works with full URLs, although in that case it is not necessary:
 
 ```
 [ext[http://tiddlywiki.com]]
 
-[ext[caption for link|http://tiddlywiki.com]]
+[ext[TW5|http://tiddlywiki.com]]
+```
 
+You can also use the extended syntax to force an external link:
+
+```
 [ext[Donate|bitcoin:1aabbdd....?amount=0.001]]
 ```