diff --git a/README.md b/README.md
index fa42cde..563402f 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,7 @@ docker create \
   -e DB_USER=<yourdbuser> \
   -e DB_PASS=<yourdbpass> \
   -e DB_DATABASE=bookstackapp \
+  -e APP_URL=your.site.here.xyz `#optional` \
   -p 6875:80 \
   -v <path to data>:/config \
   --restart unless-stopped \
@@ -123,6 +124,7 @@ Container images are configured using parameters passed at runtime (such as thos
 | `-e DB_USER=<yourdbuser>` | for specifying the database user |
 | `-e DB_PASS=<yourdbpass>` | for specifying the database password |
 | `-e DB_DATABASE=bookstackapp` | for specifying the database to be used |
+| `-e APP_URL=your.site.here.xyz` | for specifying the url your application will be accessed on (required for correct operation of reverse proxy) |
 | `-v /config` | this will store any uploaded data on the docker host |
 
 ## User / Group Identifiers
diff --git a/readme-vars.yml b/readme-vars.yml
index 073a599..6c7bd7e 100644
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -34,7 +34,7 @@ param_usage_include_ports: true
 param_ports:
   - { external_port: "6875", internal_port: "80", port_desc: "will map the container's port 80 to port 6875 on the host" }
 
-op_param_usage_include_env: true
+opt_param_usage_include_env: true
 opt_param_env_vars:
   - { env_var: "APP_URL", env_value: "your.site.here.xyz", desc: "for specifying the url your application will be accessed on (required for correct operation of reverse proxy)"}