config/graphical-session/graphics-drivers/amd: mention ROCm-SMI

Author: KeepBotting

src/config/graphical-session/graphics-drivers/amd.md

@@ -28,3 +28,8 @@ circa 2012.
 ## Video acceleration
 
 Install the `mesa-vaapi` and `mesa-vdpau` packages.
+
+## System Management Interface
+
+The `ROCm-SMI` package is required by some programs (`btop`) in order to monitor
+the GPU.