add table of config options for custom web uis

README.md

@@ -99,6 +99,11 @@ You can override the default web UI by setting the ```TRANSMISSION_WEB_HOME``` e
 
 [Combustion UI](https://github.com/Secretmapper/combustion) comes bundled with the container. You can enable it by setting ```ENABLE_COMBUSTION_UI=true```. Note that this will override the ```TRANSMISSION_WEB_HOME``` variable if set.
 
+| Variable | Function | Example |
+|----------|----------|-------|
+|`TRANSMISSION_WEB_HOME` | Set Transmission web home | `TRANSMISSION_WEB_HOME=/path/to/web/ui`|
+|`ENABLE_COMBUSTION_UI` | Use the bundled Combustion web UI | `ENABLE_COMBUSTION_UI=true`|
+
 ### Transmission configuration options
 
 You may override transmission options by setting the appropriate environment variable.