diff --git a/xep-0045.xml b/xep-0045.xml
index 311d278a..048675d9 100644
--- a/xep-0045.xml
+++ b/xep-0045.xml
@@ -515,7 +515,7 @@
   </revision>
 </header>
 <section1 topic='Introduction' anchor='intro'>
-  <p>Traditionally, instant messaging is thought to consist of one-to-one chat rather than many-to-many chat, which is called variously "groupchat" or "text conferencing". Groupchat functionality is familiar from systems such as Internet Relay Chat (IRC) and the chatroom functionality offered by popular consumer IM services. The Jabber/XMPP community developed and implemented a basic groupchat protocol as long ago as 1999. That "groupchat 1.0" (GC) protocol provided a minimal feature set for chat rooms but was rather limited in scope. This specification (Multi-User Chat or MUC) builds on the older groupchat 1.0 protocol in a backwards-compatible manner but provides advanced features such as invitations, room moderation and administration, and specialized room types.</p>
+  <p>Traditionally, instant messaging is thought to consist of one-to-one chat rather than many-to-many chat, which is called variously "groupchat" or "text conferencing". Groupchat functionality is familiar from systems such as Internet Relay Chat (IRC) and the chatroom functionality offered by popular consumer IM services. The Jabber/XMPP community developed and implemented a basic groupchat protocol as long ago as 1999. That "groupchat 1.0" (GC) protocol provided a minimal feature set for chat rooms but was rather limited in scope. This specification (Multi-User Chat or MUC) is not compatible to the groupchat 1.0 protocol, but provides advanced features such as invitations, room moderation and administration, and specialized room types.</p>
 </section1>
 
 <section1 topic='Scope' anchor='scope'>
@@ -579,7 +579,7 @@
       <di><dt>Ban</dt><dd>To remove a user from a room such that the user is not allowed to re-enter the room (until and unless the ban has been removed). A banned user has an affiliation of "outcast".</dd></di>
       <di><dt>Bare JID</dt><dd>The &lt;user@host&gt; by which a user is identified outside the context of any existing session or resource; contrast with Full JID and Occupant JID.</dd></di>
       <di><dt>Full JID</dt><dd>The &lt;user@host/resource&gt; by which an online user is identified outside the context of a room; contrast with Bare JID and Occupant JID.</dd></di>
-      <di><dt>GC</dt><dd>The minimal "groupchat 1.0" protocol developed within the Jabber community in 1999; MUC is backwards-compatible with GC.</dd></di>
+      <di><dt>GC</dt><dd>The minimal "groupchat 1.0" protocol developed within the Jabber community in 1999; Old versions of MUC were backwards-compatible with GC.</dd></di>
       <di><dt>History</dt><dd>A limited number of message stanzas sent to a new occupant to provide the context of current discussion.</dd></di>
       <di><dt>Invitation</dt><dd>A special message sent from one user to another asking the recipient to join a room; the invitation can be sent directly (see &xep0249;) or mediated through the room (as described under <link url='#invite'>Inviting Another User to a Room</link>).</dd></di>
       <di><dt>IRC</dt><dd>Internet Relay Chat.</dd></di>