diff --git a/README.md b/README.md
index b3ea1ec..0ff4d0a 100644
--- a/README.md
+++ b/README.md
@@ -105,7 +105,7 @@ Try running outfly with the command-line option "--gl", with one of these comman
 cargo run -- --gl
 ```
 
-This will result in some visual glitches, reduced performance, as well as a lot of error messages about CubeArrays which you can safely ignore.  Internally, this option sets `WGPU_BACKEND` to `gl`.
+This will result in some visual glitches, reduced performance, as well as a lot of error messages about CubeArrays which you can safely ignore.  You can alternatively achieve this by setting the environment variable `WGPU_BACKEND` to `gl`: `WPU_BACKEND=gl ./outfly`.
 
 ## The game instantly crashes!