diff --git a/index.html b/index.html
index 41952b9db..9602c376d 100644
--- a/index.html
+++ b/index.html
@@ -1177,18 +1177,40 @@ <h3><dfn>Prohibited</dfn> States and Properties</h3>
         <section id="mustContain">
           <h3>Allowed Accessibility Child Roles</h3>
           <p>
-            A list of roles which are allowed on an <a>accessibility child</a> of the element with this <a>role</a>. If the list is not empty, authors MUST only add <a>accessibility children</a> with
-            allowed roles. For example, an element with the role <rref>list</rref> allows <a>accessibility children</a> with the role <rref>listitem</rref>, but does not allow
-            <a>accessibility children</a> with the role <rref>option</rref>. If the list is empty, then there are no restrictions on accessibility child roles.
+            Roles which are allowed on an <a>accessibility child</a> of the element with this <a>role</a>.
           </p>
           <p>
-            Descendants which are not children of an element ancestor are not constrained by <em>allowed accessibility child roles</em>. For example, an <code>image</code> is not an
-            <a href="#mustContain">allowed accessibility child</a> of a <code>list</code>, but it is a valid descendant if it is also a descendant of the <code>list</code>'s
-            <a href="#mustContain">allowed accessibility child</a> <code>listitem</code>.
+            If any allowed accessibility child roles are specified, authors MUST only add <a>accessibility children</a> with
+            such roles; in particular, text nodes are not allowed in this case.
+          </p>
+          <p>
+            If no allowed accessibility child roles are specified, then there are no restrictions on accessibility children; in particular, text nodes are allowed in this case.
+          </p>
+          <aside class="example">
+            <p>
+              An element with the role <rref>list</rref> allows only <a>accessibility children</a> with the role <rref>listitem</rref>. Accordingly
+              <a>accessibility children</a> with roles other than `listitem` are invalid; text nodes are also invalid.
+            </p>
+            <pre class="example highlight html">
+&lt;div role="list"> 
+  &lt;div role="option">Option 1&lt;/li>  &lt;!-- invalid accessibility child  --&gt;
+  A text node &lt;!-- invalid accessibility child --&gt;
+&lt/div></pre>
+          <p>
+            Reversely, an element with the role <rref>article</rref> has no restrictions and can contain any combination of elements and text nodes permitted by the host language.
+          </p>
+          <pre class="example highlight html">
+              &lt;div role="article"> 
+              Here be dragons.
+              &lt/div></pre>              
+          </aside>
+          <p class="note">
+            Descendants which are not children of an element ancestor are not constrained by <em>allowed accessibility child roles</em>. For example, <rref>image</rref> is not an
+            <a href="#mustContain">allowed accessibility child</a> of a <rref>list</rref>, but it is a valid descendant if it is also a descendant of the <rref>list</rref>'s
+            <a href="#mustContain">allowed accessibility child</a> <rref>listitem</rref>.
           </p>
           <p class="note">
-            A role that has 'allowed accessibility child roles' does not imply the reverse relationship. Elements with roles in this list do not always have to be found within elements of the given
-            role. See <a href="#scope">required accessibility parent roles</a> for requirements about the context where elements of a given role will be contained.
+            A role that has 'allowed accessibility child roles' does not imply the reverse relationship. For example, <rref>row</rref> is an allowed accessibility child role for several parent roles. See <a href="#scope">required accessibility parent roles</a> for requirements about the context where elements of a given role will be contained.
           </p>
           <p class="note">
             An element with a <a href="#subclassroles">subclass role</a> of the 'allowed accessibility child role' does not fulfill this requirement. For example, the <rref>listbox</rref> role allows