Index: porters-handbook/special/chapter.xml
===================================================================
--- porters-handbook/special/chapter.xml
+++ porters-handbook/special/chapter.xml
@@ -4625,11 +4625,11 @@
     <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>
+      system.  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 id
+      should be the same for users and groups.  Make sure not to use
+      a UID or GID already used by the system or other ports.</para>
 
     <para>Please include a patch against these two files when
       requiring a new user or group to be created for the