diff --git a/README.md b/README.md
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+++ b/README.md
@@ -539,7 +539,11 @@ Manual operations on the repository while an instance is running may lead to git
 
 #### Byond
 
-The `Byond` folder contains installations of [BYOND](https://www.byond.com/) versions. The version which is used by your game code can be changed on a whim (Note that only versions >= 511.1385 have been thouroughly tested. Lower versions should work but if one doesn't function, please open an issue report) and the server will take care of installing it.
+The `Byond` folder contains installations of [BYOND](https://www.byond.com/) or [OpenDream](https://github.com/OpenDreamProject/OpenDream) versions. The version which is used by your game code can be changed on a whim (Note that only versions >= 511.1385 have been thouroughly tested. Lower versions should work but if one doesn't function, please open an issue report) and the server will take care of installing it.
+
+##### Environment Variables
+
+You can specify additional environment variables to launch your server/compiler with by adding `server.env`/`compiler.env` to your engine installation directory (i.e. `<instance>/Byond/515.1530/server.env`). These are [.env](https://hexdocs.pm/dotenvy/dotenv-file-format.html) files.
 
 #### Compiler