diff --git a/dom.bs b/dom.bs
index 61eae1c43..a0b1412c5 100644
--- a/dom.bs
+++ b/dom.bs
@@ -3647,7 +3647,7 @@ run these steps:
       "<code>node.localName</code>" is in {{MutationObserverInit/elementLocalNameFilter}}
 
       <li><var>options</var>'s {{MutationObserverInit/elementHasAttributeNameFilter}} is
-      present,and <var>options</var>'s  {{MutationObserverInit/elementHasAttributeNameFilter}}
+      present, and <var>options</var>'s  {{MutationObserverInit/elementHasAttributeNameFilter}}
       contains any of the attribute name in <var>nodeAttributesList</var>
     </ul>
     <p>then: