diff --git a/src/java/overview.html b/src/java/overview.html
index 77b1ccf8ae8..8725c1ea922 100644
--- a/src/java/overview.html
+++ b/src/java/overview.html
@@ -40,6 +40,9 @@
   amount of data into regionservers.  See the
   <a href="http://wiki.apache.org/hadoop/Hbase/FAQ#6">FAQ: Why do I see "java.io.IOException...(Too many open files)" in my logs?</a>
   for how to up the limit.</li>
+      <li>The clocks on cluster members should be in basic alignments.  Some skew is tolerable but
+      wild skew can generate odd behaviors.  Run <a href="http://en.wikipedia.org/wiki/Network_Time_Protocol">NTP</a>
+      on your cluster, or an equivalent.</li>
 </ul>
 
 <h2><a name="getting_started" >Getting Started</a></h2>