diff --git a/index.html b/index.html
index 265278f..d828d2a 100644
--- a/index.html
+++ b/index.html
@@ -816,6 +816,12 @@ <h3 id="reading-current-states">
             <li>Return the {{PermissionState}} enum value that represents the permission state of
             |feature|, taking into account any [=powerful feature/permission state constraints=]
             for |descriptor|'s {{PermissionDescriptor/name}}.
+                <p class="note">
+                  For privacy reasons the user agent can return the {{PermissionState/"prompt"}}
+                  state instead of {{PermissionState/"denied"}}. This is because the 
+                  {{PermissionState/"denied"}} state could reveal information about prior visits
+                  that user agents might not be willing to expose. 
+               </p>
             </li>
           </ol>
         </div>