diff --git a/documentation/poky-ref-manual/ref-variables.xml b/documentation/poky-ref-manual/ref-variables.xml
index 4e7f85c37d..a5320283f6 100644
--- a/documentation/poky-ref-manual/ref-variables.xml
+++ b/documentation/poky-ref-manual/ref-variables.xml
@@ -236,7 +236,18 @@
                 </para>
 
                 <para>
-                    Use the following form:
+                    If you do not provide a <filename>BB_DISKMON_WARNINTERVAL</filename>
+                    variable and you do use <filename>BB_DISKMON_DIRS</filename> with 
+                    the "WARN" action, the disk monitoring interval defaults to 
+                    the following:
+                    <literallayout class='monospaced'>
+     BB_DISKMON_WARNINTERVAL = "50M,5K"
+                    </literallayout>
+                </para>
+
+                <para>
+                    When specifying the variable in your configuration file, 
+                    use the following form:
                     <literallayout class='monospaced'>
      BB_DISKMON_WARNINTERVAL = "&lt;disk_space_interval&gt;,&lt;disk_inode_interval&gt;"