diff --git a/jupyterlab/labhubapp.py b/jupyterlab/labhubapp.py
index d2d28cff21d2..78ad5c1d8e4b 100644
--- a/jupyterlab/labhubapp.py
+++ b/jupyterlab/labhubapp.py
@@ -12,7 +12,19 @@
     raise ImportError('You must have jupyterhub installed for this to work.')
 else:
     class SingleUserLabApp(SingleUserNotebookApp, LabApp):
-
+        """
+        A sublcass of JupyterHub's SingleUserNotebookApp which includes LabApp
+        as a mixin. This makes the LabApp configurables available to the spawned
+        jupyter server.
+
+        If you don't need to change any of the configurables from their default
+        values, then this class is not necessary, and you can deploy JupyterLab
+        by ensuring that its server extension is enabled and setting the
+        `Spawner.default_url` to '/lab'.
+
+        If you do need to configure JupyterLab, then use this application by
+        setting `Spawner.cmd = ['jupyter-labhub']`.
+        """
         @default("default_url")
         def _default_url(self):
             """when using jupyter-labhub, jupyterlab is default ui"""