diff --git a/index.html b/index.html
index 048f243..7dc1f4b 100644
--- a/index.html
+++ b/index.html
@@ -643,12 +643,15 @@ <h2>Security</h2>
           </ul>
         </div>
         <p><span class="rfc2119-assertion" id="common-constraints-security-2">
-            Conformant Consumers MUST support all of these security schemes.</span>
+            Conformant Consumers MUST support at least all of these security schemes.</span>
         </p>
 
         <p><span class="rfc2119-assertion" id="common-constraints-security-3">
             A Thing MAY implement multiple security schemes.</span>
         </p>
+        <p><span class="rfc2119-assertion" id="common-constraints-security-4">
+            A Thing MUST support at least one of the above security schemes.</span>
+        </p>
 
         <p><span class="rfc2119-assertion" id="common-constraints-security-6">
           Conformant Consumers MUST support security bootstrapping for all
@@ -901,7 +904,7 @@ <h3>Media Types for Link Targets</h3>
 
     <!-- Errors -->
     <section id="common-constraints-errors">
-      <h2 id="error-responses">Errors</h2>
+      <h3 id="error-responses">Errors</h3>
       <p>
         <span class="rfc2119-assertion" id="common-constraints-errors-1">
           If any of the operations defined in the protocol bindings of HTTP