diff --git a/jupyterlab/commands.py b/jupyterlab/commands.py
index 65022953bdba..b294f9fe5569 100644
--- a/jupyterlab/commands.py
+++ b/jupyterlab/commands.py
@@ -893,7 +893,7 @@ def link_package(self, path):
         """
         path = _normalize_path(path)
         if not osp.exists(path) or not osp.isdir(path):
-            msg = 'Can install "%s" only link local directories'
+            msg = 'Cannot install "%s" only link local directories'
             raise ValueError(msg % path)
 
         with TemporaryDirectory() as tempdir:
diff --git a/jupyterlab/labapp.py b/jupyterlab/labapp.py
index 8c719e85acd4..b3a67b1a4cdd 100644
--- a/jupyterlab/labapp.py
+++ b/jupyterlab/labapp.py
@@ -48,7 +48,7 @@
 If you are building via the `jupyter lab build` command, you can disable
 these options like so:
 
-jupyter lab build --dev-mode=False --minimize=False
+jupyter lab build --dev-build=False --minimize=False
 
 You can also disable these options for all JupyterLab builds by adding these
 lines to a Jupyter config file named `jupyter_config.py`: