diff --git a/doc/glossary.rst b/doc/glossary.rst
index df7a0d18afa..12e40f59c98 100644
--- a/doc/glossary.rst
+++ b/doc/glossary.rst
@@ -274,6 +274,11 @@
 	:ref:`MON<arch_monitor>`
 		The Ceph monitor software.
 
+        Monitor Store
+                The persistent storage that is used by the Monitor. This
+                includes the Monitor's RocksDB and all related files in
+                ``/var/lib/ceph``.
+
 	Node
                 See :term:`Ceph Node`.