diff --git a/doc/rbd/rbd-openstack.rst b/doc/rbd/rbd-openstack.rst
index 455e9609ad3..faf9d09297b 100644
--- a/doc/rbd/rbd-openstack.rst
+++ b/doc/rbd/rbd-openstack.rst
@@ -15,10 +15,14 @@ processor. The following diagram depicts the OpenStack/Ceph technology stack.
 
 .. ditaa::  +---------------------------------------------------+
             |                    OpenStack                      |
-            +---------------------------------------------------+            
+            +---------------------------------------------------+
             |                     libvirt                       |
-            +---------------------------------------------------+            
-            |                     QEMU/RBD                      |
+            +------------------------+--------------------------+
+                                     |
+                                     | configures
+                                     v
+            +---------------------------------------------------+
+            |                       QEMU                        |
             +---------------------------------------------------+
             |                      librbd                       |
             +---------------------------------------------------+