diff --git a/tmdeploy/share/playbooks/tissuemaps/roles/database-client/defaults/main.yml b/tmdeploy/share/playbooks/tissuemaps/roles/database-client/defaults/main.yml
index 8fc56c0..8415dce 100644
--- a/tmdeploy/share/playbooks/tissuemaps/roles/database-client/defaults/main.yml
+++ b/tmdeploy/share/playbooks/tissuemaps/roles/database-client/defaults/main.yml
@@ -14,5 +14,6 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ---
-# This can be an array of mappings with keys "name", "password" and "email"
-tm_users: []
+tm_users: []       # array of mappings with keys "name", "password" and "email"
+
+db_nodes: 1        # number of worker nodes in the cluster