diff --git a/index.html b/index.html
index 153c118..db39ee4 100644
--- a/index.html
+++ b/index.html
@@ -1636,7 +1636,7 @@ <h2>Dictionary <a class="idlType">DisplayMediaStreamOptions</a>
 
               <dd>If present, signals whether the application would like system
               audio to be included among the possible audio sources offered to
-              the user.</dd>
+              the user. The user agent MAY ignore this hint.</dd>
 
 
               <dt><dfn><code>surfaceSwitching</code></dfn> of type
@@ -1645,7 +1645,8 @@ <h2>Dictionary <a class="idlType">DisplayMediaStreamOptions</a>
 
               <dd>If present, signals whether the application would like the
               user agent to offer the user an option to dynamically switch the
-              captured [=display surface=].</dd>
+              captured [=display surface=]. The user agent MAY ignore this
+              hint.</dd>
 
 
               <dt><dfn><code>monitorTypeSurfaces</code></dfn> of type