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+<h2 class="heading-medium">
+  Optional content placeholders
+</h2>
+<p>
+  Use double brackets and '??' to define optional content. You can then specify whether to include that content or not for each recipient.
+</p>
+<p>
+  For example if you only want to show something to people who are under 18:
+</p>
+<div class="panel panel-border-wide">
+  <p>
+    ((under18??Please get your application signed by a parent or guardian))
+  </p>
+</div>
+<p>
+Specify 'yes' or 'no' for this content to appear (or not), when sending messages.
+</p>