diff --git a/1-START-WRITING.html b/1-START-WRITING.html
index 34a76b35..87365be1 100644
--- a/1-START-WRITING.html
+++ b/1-START-WRITING.html
@@ -34,7 +34,7 @@
 	</li>
 </ol>
 
-<p>&nbsp;The Insert... menu gives you different options depending on where you add the new paragraph. For example, if you've used the magic line to add a new paragraph inside a sidebar, you won't be allowed to insert a section (sections are only allowed to be used as high-level container elements).</p>
+<p>&nbsp;The Insert... menu gives you different options depending on where you add the new paragraph. For example, if you've used the magic line to add a new paragraph inside a sidebar, you won't be allowed to insert a section (in the HTMLBook spec,&nbsp;sections are only allowed to be used as high-level container elements).</p>
 
 <div data-type="warning">
 <h1>Warning</h1>