diff --git a/README.md b/README.md
index eca044c..58ea4be 100755
--- a/README.md
+++ b/README.md
@@ -3,15 +3,19 @@
 Automatically generates Let's Encrypt certificates using a lightweight Docker container without requiring any ports to be exposed for DNS challenges.
 
 Variables:
+
 * `DUCKDNS_TOKEN`: Duck DNS Account Token
 * `DUCKDNS_DOMAIN`: Full Duck DNS domain (e.g. `test.duckdns.org`)
-* `LETSENCRYPT_EMAIL`: Email used for certificate renewal notifications
+* `LETSENCRYPT_EMAIL`: Email used for certificate renewal notifications (optional)
 * `LETSENCRYPT_WILDCARD`: `true` or `false`, indicating whether the SSL certificate should be for all subdomains of `DUCKDNS_DOMAIN` (i.e. `*.test.duckdns.org`), or just the main domain (i.e. `test.duckdns.org`)
 
 **Note:** The format of `DUCKDNS_DOMAIN` should be the same regardless of the value of `LETSENCRYPT_WILDCARD`.
 
 Volumes:
+
 * `<certs>:/etc/letsencrypt`: A named or hosted volume which allows SSL certificates to persist and be accessed by other containers
 
-TODO:
+**Note:** If a hosted volume is used, the volume should be mounted in an unused directory in another container to prevent access conflicts.
+
+#### TODO:
 * Implement tests so `depends_on` can be used in docker-compose to prevent other containers from initialising until certificates are ready