diff --git a/config.yaml b/config.yaml
index 45e073f8..c0067eb8 100644
--- a/config.yaml
+++ b/config.yaml
@@ -171,4 +171,4 @@ options:
     default:
     description: |
       Minimum number of units expected to exist before charm will attempt to
-      form a cluster.
+      form a rabbitmq cluster.
diff --git a/unit_tests/test_rabbitmq_server_relations.py b/unit_tests/test_rabbitmq_server_relations.py
index 4f3b881c..b7af05f6 100644
--- a/unit_tests/test_rabbitmq_server_relations.py
+++ b/unit_tests/test_rabbitmq_server_relations.py
@@ -129,3 +129,20 @@ class RelationUtil(TestCase):
         mock_peer_store_and_set.assert_called_with(
             relation_settings={'private-address': ipv6_addr},
             relation_id=None)
+
+    @patch.object(rabbitmq_server_relations, 'related_units')
+    @patch.object(rabbitmq_server_relations, 'relation_ids')
+    @patch.object(rabbitmq_server_relations, 'config')
+    def test_is_sufficient_peers(self, mock_config, mock_relation_ids,
+                                 mock_related_units):
+        _config = {'min-cluster-size': None}
+        mock_config.side_effect = lambda key: _config.get(key)
+        self.assertTrue(rabbitmq_server_relations.is_sufficient_peers())
+
+        mock_relation_ids.return_value = ['cluster:0']
+        mock_related_units.return_value = ['test/0']
+        _config = {'min-cluster-size': 3}
+        self.assertFalse(rabbitmq_server_relations.is_sufficient_peers())
+
+        mock_related_units.return_value = ['test/0', 'test/1']
+        self.assertTrue(rabbitmq_server_relations.is_sufficient_peers())