diff --git a/README.md b/README.md
index 8220b9f..4173fef 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ sudo make install
 
 ## Usage
 
-Because `nvbright` requires direct access to `/dev/mem` to map GPU MMIO registers and executes `/usr/sbin/pciconf`, it must be run as root (e.g., with `sudo` or `doas`).
+Because `nvbright` requires direct access to `/dev/mem` to map GPU MMIO registers and executes `/usr/sbin/pciconf`, it must be run as root (e.g., with `sudo` or `doas`). If using the standard `make install` procedure, the binary is installed with setuid bit, so it may be run by regular users.
 
 ### Command syntax