[master] fix 'rndc freeze' doc, and mention 'rndc sync'

diff --git a/doc/arm/Bv9ARM-book.xml b/doc/arm/Bv9ARM-book.xml
index 77a7342ae03584799fae3e2352dec8111bfdfa3d..c44a9aded89d58c36d0995639c30485c94c7117f 100644 (file)
--- a/doc/arm/Bv9ARM-book.xml
+++ b/doc/arm/Bv9ARM-book.xml
@@ -1477,15 +1477,25 @@ controls {
 
        <para>
          If you have to make changes to a dynamic zone
-         manually, the following procedure will work: Disable dynamic updates
-             to the zone using
+         manually, the following procedure will work:
+         Disable dynamic updates to the zone using
          <command>rndc freeze <replaceable>zone</replaceable></command>.
-         This will also remove the zone's <filename>.jnl</filename> file
-         and update the master file.  Edit the zone file.  Run
+         This will update the zone's master file with the changes
+         stored in its <filename>.jnl</filename> file.
+         Edit the zone file.  Run
          <command>rndc thaw <replaceable>zone</replaceable></command>
          to reload the changed zone and re-enable dynamic updates.
        </para>
 
+       <para>
+         <command>rndc sync <replaceable>zone</replaceable></command>
+         will update the zone file with changes from the journal file
+         without stopping dynamic updates; this may be useful for viewing
+         the current zone state.  To remove the <filename>.jnl</filename>
+         file after updating the zone file, use
+         <command>rndc sync -clean</command>.
+       </para>
+
       </sect2>
 
     </sect1>