diff --git a/brightness-widget/README.md b/brightness-widget/README.md
index 3f23de5..d7690b4 100644
--- a/brightness-widget/README.md
+++ b/brightness-widget/README.md
@@ -30,6 +30,7 @@ Firstly you need to get the current brightness level. There are two options:
     light -G
     49.18
     ```
+Depending on the chosen option change `get_brightness_cmd` variable in **brightness.lua**.
 
 Then in **rc.lua** add the import on top of the file and then add widget to the wibox: