diff --git a/index.bs b/index.bs
index 6ce56771..93cef809 100644
--- a/index.bs
+++ b/index.bs
@@ -12352,8 +12352,8 @@ The value of the [=function object=]’s <code class="idl">name</code> property
 </div>
 
 <div class="note">
-    Specifications use various wordings to reference the "[=implements=]" algorithm,
-    such as "|object| is an |interface| object", to mean, "|object| implements |interface|".
+    Specifications may reference the concept "|object| implements |interface|"
+    in various ways, including "|object| is an |interface| object".
 </div>
 
 Every [=platform object=] is associated with a global environment, just
@@ -12385,8 +12385,8 @@ Issue: The relevant |this| value is not always well-defined; see
 <a href="https://github.com/heycam/webidl/issues/135">#135</a> for discussion.
 
 <div class="note">
-    Specifications use various wordings to reference the "[=create an object implementing
-    the interface=]" algorithm, such as "a new |interface| object".
+    Specifications may refer to the "[=create an object implementing the
+    interface=]" algorithm in various ways, including "a new |interface| object".
 </div>
 
 <div class="note">
@@ -12394,11 +12394,11 @@ Issue: The relevant |this| value is not always well-defined; see
     The set of interfaces that a [=platform object=] [=implements=] does not change over
     the lifetime of the object.
 
-    Multiple [=interface objects=] associated with different [=Realm/global objects=]
-    will allocate [=platform objects=] which have \[[PrimaryInterface]] internal
-    slots referencing the same underlying [=interface=]. For example, a page may
-    contain a same-origin iframe, with the iframe's method being called on the
-    main page's element of the same kind, with no exception thrown.
+    Multiple [=platform objects=] with different [=Realm/global objects=] will share
+    a reference to the same [=interface=] in their \[[PrimaryInterface]] internal
+    slots. For example, a page may contain a same-origin iframe, with the iframe's
+    method being called on the main page's element of the same kind, with no exception
+    thrown.
 
     [=Interface mixins=] do not participate directly in the evaluation of the [=implements=]
     algorithm. Instead, each [=interface=] that the [=interface mixin=] is [=included=] in
@@ -12411,9 +12411,7 @@ Issue: The relevant |this| value is not always well-defined; see
 The <dfn id="dfn-primary-interface" export>primary interface</dfn> of a platform object
 that [=implements=] one or more interfaces is the value of the object's
 \[[PrimaryInterface]] internal slot, which is is the most-derived [=interface=]
-that it [=implements=].  The value of the \[[Prototype]] [=internal slot=]
-of the platform object is the [=interface prototype object=]
-of the [=primary interface=] from the [=platform object=]’s associated global environment.
+that it [=implements=].
 
 The global environment that a given [=platform object=]
 is associated with can <dfn id="dfn-change-global-environment" for="global environment" export>change</dfn> after it has been created.  When