user-manual-ref-variables.xml: Edits to BB_GENERATE_MIRROR_TARBALLS variable

Added some clarification around who would like to set this
variable and why.

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>

diff --git a/doc/user-manual/user-manual-ref-variables.xml b/doc/user-manual/user-manual-ref-variables.xml
index ff2d59a6e61b1f20b6bc08dc45ee886ab33e7a7b..907e6c608ca396956524d6c0673c5434f9371603 100644 (file)
--- a/doc/user-manual/user-manual-ref-variables.xml
+++ b/doc/user-manual/user-manual-ref-variables.xml
@@ -373,6 +373,8 @@
                     Git metadata, to be placed in the
                     <link linkend='var-DL_DIR'><filename>DL_DIR</filename></link>
                     directory.
+                    Anyone wishing to create a source mirror would want to
+                    enable this variable.
                 </para>
 
                 <para>