diff --git a/pytorch_lightning/trainer/__init__.py b/pytorch_lightning/trainer/__init__.py
index 8c08d54d9530b..fd25ca129daf8 100644
--- a/pytorch_lightning/trainer/__init__.py
+++ b/pytorch_lightning/trainer/__init__.py
@@ -358,6 +358,7 @@ def on_train_end(self, trainer, pl_module):
 cluster_environment
 ^^^^^^^^^^^^^^^^^^^
 Environment to connect arbitrary cluster backends. Lightning automatically handles:
+
 - SLURM
 - TorchElastic
 
@@ -365,7 +366,7 @@ def on_train_end(self, trainer, pl_module):
 
 .. code-block:: python
 
-    from pytorch_lightning.cluster_environments import ClusterEnvironment
+    from pytorch_lightning.cluster_environments import cluster_environment
 
     class MyCluster(ClusterEnvironment):
 
@@ -378,6 +379,8 @@ def master_port(self):
         def world_size(self):
             return the_world_size
 
+    trainer = Trainer(cluster_environment=cluster_environment())
+
 default_root_dir
 ^^^^^^^^^^^^^^^^