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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -24,6 +24,13 @@ services:
       - /path/to/downloads:/downloads

 ```

 

+## Configuration via environment variables

+

+Certain values can be set via environment variables, using the `-e` parameter on the docker command line, or the `environment:` section in docker-compose.

+

+* __DOWNLOAD_DIR__: path to where the downloads will be saved. Defaults to "/downloads" in the docker image, and "." otherwise.

+* __URL_PREFIX__: base path for the web server (for use when hosting behind a reverse proxy). Defaults to "/".

+

 ## Build and run locally

 

 Make sure you have node.js installed.