diff --git a/dom.bs b/dom.bs
index d588c12b..182f246d 100644
--- a/dom.bs
+++ b/dom.bs
@@ -2079,9 +2079,6 @@ interface that inherits from it, and a <var>realm</var>:
      <li><p>Assert: <var>sourceSignal</var> is not [=AbortSignal/aborted=] and not
      [=AbortSignal/dependent=].
 
-     <li><p>If <var>resultSignal</var>'s [=AbortSignal/source signals=] <a for=set>contains</a>
-     <var>sourceSignal</var>, then <a for=iteration>continue</a>.
-
      <li><p><a for=set>Append</a> <var>sourceSignal</var> to <var>resultSignal</var>'s
      [=AbortSignal/source signals=].