Document using wildcards when blocking

manual/manual.html

@@ -880,6 +880,12 @@ enter the thing that you wish to block and then select the
 <p>When creating a block you can also add a space followed by any text
 describing the reason for the block. Such as:</p>
 <pre class="text"><code>annoyingdomain.com A spam instance</code></pre>
+<p>You can also use wildcards when blocking nicknames or domains. To
+block a nickname, regardless of what instance it comes from:</p>
+<pre class="text"><code>trollnickname@* Some comment about the reason for the block</code></pre>
+<p>Or if a troll is using the same nickname followed by some random
+number then you can add an extra wildcard:</p>
+<pre class="text"><code>trollnickname*@* Some comment about the reason for the block</code></pre>
 <p>If you want to see what is being blocked at the instance level then
 select the <strong>Info</strong> button.</p>
 <h3 id="web-crawlers-and-search-bots">Web crawlers and search bots</h3>

manual/manual.md

@@ -628,6 +628,18 @@ When creating a block you can also add a space followed by any text describing t
 annoyingdomain.com A spam instance
 ```
 
+You can also use wildcards when blocking nicknames or domains. To block a nickname, regardless of what instance it comes from:
+
+``` text
+trollnickname@* Some comment about the reason for the block
+```
+
+Or if a troll is using the same nickname followed by some random number then you can add an extra wildcard:
+
+``` text
+trollnickname*@* Some comment about the reason for the block
+```
+
 If you want to see what is being blocked at the instance level then select the **Info** button.
 
 ### Web crawlers and search bots