diff --git a/README.md b/README.md
index 37cd4dd009c8ea003c4c7020f8919fb05ed5a48a..8f193ff9731b06282e3ccc78d00ead538edbbca4 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,29 @@ The ouput file is an unsorted list of files in uncompressed ASCII.  Further proc
 
 ## Processing the output file
 
+### Gitlab Container Registry Authentication
+
+Some automated tools in this repository use a container for processing to simplify environment management. The container itself is built using the spec in ./Dockerfile and available at `gitlab.rc.uab.edu:4567/<group>/gpfs-policy`. The shell scripts will automatically download this container if it is not detected in the working directory.
+
+In order to access the container, you will need to add a personal access token from your Gitlab account and register it to Singularity since the repository is not public. Do the following:
+
+1. Go to `gitlab.rc.uab.edu` and sign in with your BlazerID and password
+2. Click your user icon in the top left and select `Preferences`
+3. Select `Access Tokens` in the left menu
+4. Click `Add New Token`
+    1. Give the token a name (i.e. `Cheaha Singularity`)
+    2. Remove the expiration date. It will default to one year from registration
+    3. Add the `read_registry` scope
+    4. Select `Create personal access token`
+5. In the green box, click the button to copy the token
+6. On Cheaha, create a text file in a secure spot and paste the token there.
+7. Run `cat <token_file> | singularity registry login -u $USER --password-stdin docker://gitlab.rc.uab.edu:4567`
+    1. If it succeeds, you will see a message similar to `INFO:    Token stored in $HOME/.singularity/docker-config.json`
+8. Delete the text file with the access token
+9. Test access by pulling the container. For example:
+    - `singularity pull gpfs.sif docker://gitlab.rc.uab.edu:4567/<owner>/gpfs-policy:latest`
+    - Replace `<owner>` with the owner of the repo you're pulling from. Containers built in forks of a repository will have their containers in the forked registry
+
 ### Split and compress
 
 ### Pre-parse output for Python