diff --git a/bumblebee/modules/nvidiagpu.py b/bumblebee/modules/nvidiagpu.py
index b60f04e..87c34f5 100644
--- a/bumblebee/modules/nvidiagpu.py
+++ b/bumblebee/modules/nvidiagpu.py
@@ -1,6 +1,11 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+"""Displays GPU name, temperature and memory usage.
+
+Requires nvidia-smi
+"""
+
 import subprocess
 import bumblebee.input
 import bumblebee.output