diff --git a/README.md b/README.md
index c1138fff..26a8a7a4 100755
--- a/README.md
+++ b/README.md
@@ -147,7 +147,7 @@ Additional flags are available for customizing your install:
 
 -v, --no-venv           Do not create a virtual environment for the dependencies.
 -e, --emulator-only     Do not install dependencies under sudo. Skips building matrix dependencies (equivalent to -m)
--d, --driver            Specify a branch name or commit SHA for the rpi-rgb-led-matrix library. (Defaults to "$DRIVER")
+-d, --driver            Specify a branch name or commit SHA for the rpi-rgb-led-matrix library. (Optional. Defaults may change.)
 
 -h, --help              Display this help message
 ```