diff --git a/README.md b/README.md
index 83b209d..06ca0dc 100755
--- a/README.md
+++ b/README.md
@@ -7,7 +7,8 @@ Variables:
 * `DUCKDNS_TOKEN`: Duck DNS account token (obtained from [Duck DNS](https://www.duckdns.org))
 * `DUCKDNS_DOMAIN`: Full Duck DNS domain (e.g. `test.duckdns.org`)
 * `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`) (default: `false`)
+* `LETSENCRYPT_WILDCARD`: `true` or `false`, indicating whether the SSL certificate should be for subdomains *only* of `DUCKDNS_DOMAIN` (i.e. `*.test.duckdns.org`), or for the main domain *only* (i.e. `test.duckdns.org`) (default: `false`)
+* `TESTING`: `true` or `false`, indicating whether a staging SSL certificate should be generated or not (default: `false`)
 
 **Note:** The format of `DUCKDNS_DOMAIN` should be the same regardless of the value of `LETSENCRYPT_WILDCARD`.
 
@@ -18,4 +19,4 @@ Volumes:
 **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
+- [ ] Implement tests so `depends_on` can be used in docker-compose to prevent other containers from initialising until certificates are ready