diff --git a/NixOS.md b/NixOS.md
index 848a86a..8df55fe 100644
--- a/NixOS.md
+++ b/NixOS.md
@@ -436,6 +436,9 @@ Video acceleration:
   - Video Decode and Presentation API for Unix (VDPAU).
   - Verifying: `vdpauinfo`. https://wiki.archlinux.org/title/Hardware_video_acceleration#Verifying_VDPAU
 
+Verification in general:
+- Encode a video or play a game and watch AMD GPU usage with `radeontop`.
+
 Configuration example for an AMD GPU:
 
 ```nix