doc: Added index reference.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>

diff --git a/doc/rados/configuration/mon-config-ref.rst b/doc/rados/configuration/mon-config-ref.rst
index f23a056cc6b4024d80e07bb45fb8b9ed9e2527fb..fcde922df3f1bbf1fd913ddba9736f45117235ec 100644 (file)
--- a/doc/rados/configuration/mon-config-ref.rst
+++ b/doc/rados/configuration/mon-config-ref.rst
@@ -58,6 +58,7 @@ perform store-wide synchronization.
 In Ceph versions 0.58 and earlier, Ceph monitors use a Paxos instance for
 each service and store the map as a file. 
 
+.. index:: cluster map
 
 Cluster Maps
 ------------