diff --git a/docs/using/common.md b/docs/using/common.md
index e33f78cf..79345f95 100644
--- a/docs/using/common.md
+++ b/docs/using/common.md
@@ -23,14 +23,14 @@ docker run -d -p 8888:8888 jupyter/base-notebook start-notebook.sh --NotebookApp
 
 ## Docker Options
 
-You may instruct the `start-notebook.sh` script to customize the container environment before launching the notebook server. You do so by passing 
+You may instruct the `start-notebook.sh` script to customize the container environment before launching the notebook server. You do so by passing
 arguments to the `docker run` command.
 
 - `-e NB_USER=<username>` - The desired username and associated home folder. Default value is `jovyan`. Setting `NB_USER` refits the `jovyan`
-  default user and ensures that the desired user has the correct file permissions for the new home directory that gets created at 
+  default user and ensures that the desired user has the correct file permissions for the new home directory that gets created at
   `/home/<username>`. For this option to take effect you must run the container with `--user root`, set the working directory `-w /home/${NB_USER}`
   and set the environment variable `-e CHOWN_HOME=yes`.
-  
+
   Example Usage:
 
   ```bash
@@ -38,8 +38,8 @@ arguments to the `docker run` command.
   ```
 
 - `-e NB_UID=1000` - Instructs the startup script to switch the numeric user ID of `${NB_USER}` to the given value. Default value is `1000`.
-  This feature is useful when mounting host volumes with specific owner permissions. For this option to take effect, you must run the container 
-  with `--user root`. (The startup script will `su ${NB_USER}` after adjusting the user ID.) You might consider using the modern Docker options 
+  This feature is useful when mounting host volumes with specific owner permissions. For this option to take effect, you must run the container
+  with `--user root`. (The startup script will `su ${NB_USER}` after adjusting the user ID.) You might consider using the modern Docker options
   `--user` and `--group-add` instead. See bullet points regarding `--user` and `--group-add`.
 
 - `-e NB_GID=100` - Instructs the startup script to change the primary group of`${NB_USER}` to `${NB_GID}`
@@ -57,8 +57,8 @@ arguments to the `docker run` command.
 
 - `-e NB_UMASK=<umask>` - Configures Jupyter to use a different `umask` value from default, i.e. `022`.
   For example, if setting `umask` to `002`, new files will be readable and writable by group members instead of just writable by the owner.
-  Wikipedia has a good article about [`umask`](https://en.wikipedia.org/wiki/Umask). While the default `umask` value should be sufficient for most use cases, you can set the `NB_UMASK` value to fit your requirements. _Note that `NB_UMASK` when set only applies to the Jupyter process itself - you cannot use it to set a 
-  `umask` for additional files created during run-hooks. For example, via `pip` or `conda`. If you need to set a `umask` for these you must set `umask` for 
+  Wikipedia has a good article about [`umask`](https://en.wikipedia.org/wiki/Umask). While the default `umask` value should be sufficient for most use cases, you can set the `NB_UMASK` value to fit your requirements. _Note that `NB_UMASK` when set only applies to the Jupyter process itself - you cannot use it to set a
+  `umask` for additional files created during run-hooks. For example, via `pip` or `conda`. If you need to set a `umask` for these you must set `umask` for
   each command._
 
 - `-e CHOWN_HOME=yes` - Instructs the startup script to change the `${NB_USER}` home directory owner and group to the current value of `${NB_UID}` and `${NB_GID}`.