diff --git a/Macro-Actions.md b/Macro-Actions.md
index 4c5b311..d4027be 100644
--- a/Macro-Actions.md
+++ b/Macro-Actions.md
@@ -45,7 +45,9 @@ Toggles whether or not the button should display the macro's icon
 The macro to execute. In 'hotbar' mode, this is a value between 1 and 50. In 'visible hotbar' this is a value between 1 and 10. 10 corresponds with the macro at location 0 in the Foundry hotbar.
 
 #### Background
-Sets the background color of the button
+Sets the background color of the button. The icon needs to have transparent parts (so no jpeg).<br>
+You set the color using hexadecimal values, and it must start with '#'.<br>
+You could use a [color picker](https://htmlcolorcodes.com/color-picker/) to find the right hex value.
 
 ## Mode: Macro Board