Index: head/en_US.ISO8859-1/books/porters-handbook/special/chapter.xml
===================================================================
--- head/en_US.ISO8859-1/books/porters-handbook/special/chapter.xml
+++ head/en_US.ISO8859-1/books/porters-handbook/special/chapter.xml
@@ -4624,12 +4624,12 @@
   <sect1 xml:id="users-and-groups">
     <title>Adding Users and Groups</title>
 
-    <para>Some ports require a certain user to be on the installed
-      system.  Choose a free UID from 50 to 999 and register it
-      either in <filename>ports/UIDs</filename> (for users) or in
-      <filename>ports/GIDs</filename> (for groups).  Make sure
-      not to use a UID already used by the system or other
-      ports.</para>
+    <para>Some ports require a particular user account to be present, usually
+      for daemons that run as that user.  For these ports, choose a
+      <emphasis>unique</emphasis> UID from 50 to 999 and register it in
+      <filename>ports/UIDs</filename> (for users) and
+      <filename>ports/GIDs</filename> (for groups).  The unique identification
+      should be the same for users and groups.</para>
 
     <para>Please include a patch against these two files when
       requiring a new user or group to be created for the