diff --git a/index.bs b/index.bs
index 68a80fe..d86fb18 100644
--- a/index.bs
+++ b/index.bs
@@ -752,8 +752,8 @@ is a [=model context=] [=struct=] created alongside the {{ModelContext}}.
 
   <dt><code><var ignore>document</var>.{{Document/modelContext}}.{{ModelContext/getTools(options)}}</code></dt>
   <dd>
-    <p>Returns a promise that resolves to a list of registered tools from this document and its
-    descendants that are exposed to this document. This API is designed for so-called "in-page"
+    <p>Returns a promise that resolves to a list of registered tools exposed to this document by
+    active documents in the same [=traversable navigable=]. This API is designed for so-called "in-page"
     agents written in JavaScript, and possibly living in <{iframe}>s. The [=user agent=]'s [=browser
     agent=] uses a different internal mechanism to retrieve the tools exposed to it.</p>
   </dd>