diff --git a/examples/postgres_db/README.md b/examples/postgres_db/README.md
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+## Postgres Dockerfile
+This example shows a Dockerfile that can be used to connect Jupyterhub to a Postgres backend.
+
+### Running the Container
+0. Replace `ENV JPY_PSQL_PASSWORD arglebargle` with your own password in the Dockerfile.
+1. `cd` to the root of your jupyterhub repo.
+2. Build the postgres image with `docker build -t jupyterhub-postgres examples/postgres_db/`.  This may take some time the first time it's run.
+3. Run the image with `docker run -d -p 5433:5432 jupyterhub-postgres`.  This will start a postgres daemon container in the background that's listening on your localhost port 5433.
+4. Run jupyterhub with `jupyterhub--db=postgresql://jupyterhub:<password>@localhost:5433/jupyterhub`.