[system-administrators-guide] Adding explanation of rtcsync directive

[stephenw]

commit 834fa56c9faa5a2aad9812ed1950c4a94af95a6d
Author: Stephen Wadeley <swadeley at redhat.com>
Date:   Wed Jul 10 09:28:23 2013 +0200

    Adding explanation of rtcsync directive

 en-US/Configuring_NTP_using_the_Chrony_suite.xml |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/en-US/Configuring_NTP_using_the_Chrony_suite.xml b/en-US/Configuring_NTP_using_the_Chrony_suite.xml
index ef95a3e..b8ab28e 100644
--- a/en-US/Configuring_NTP_using_the_Chrony_suite.xml
+++ b/en-US/Configuring_NTP_using_the_Chrony_suite.xml
@@ -400,6 +400,14 @@ Not all real-time clocks are supported as their code system-specific.
 				</listitem>
       </varlistentry>
 
+                                      <varlistentry>
+                  <term>rtcsync</term>
+                   <listitem>
+					<para>
+            The <command>rtcsync</command> directive is present in the <filename>/etc/chrony.conf</filename> file by default. This will inform the kernel the system clock is kept synchronized and the kernel will update the real-time clock every 11 minutes.</para>
+				</listitem>
+      </varlistentry>
+
 		      </variablelist>
 </para>
   </section>