docs/how_to/hypervisors/openstack.md in beaker-2.50.0 vs docs/how_to/hypervisors/openstack.md in beaker-2.51.0

@@ -103,6 +103,14 @@
       openstack_auth_url: http://10.10.10.10:5000/v2.0/tokens
       openstack_tenant: testing
       openstack_network : testing
       openstack_keyname : nopass
 
+### Security groups
 
+A security group is a set of rules for incoming and outgoing traffic to 
+an instance.  You can associate a host with one or many security groups
+in the `CONFIG` section of your hosts file:
+
+    security_group: ['my_sg', 'default']
+
+This is an optional config parameter.