diff --git a/Overlay-image-configuration.md b/Overlay-image-configuration.md
index e08930a..6717fed 100644
--- a/Overlay-image-configuration.md
+++ b/Overlay-image-configuration.md
@@ -70,6 +70,9 @@ The format is:
 
 `button` corresponds to the input event being generated. The names are the same as in the general input config, e.g. input_player1_start would translate to start here. overlay_next is a special bind designed to swap to the next overlay, or wrap around to the first one.
 
+For an up-to-date view of what buttons are called, check:
+https://github.com/Themaister/RetroArch/blob/master/input/input_common.c#L499
+
 `position_x` and `position_y` are the x and y coordinates in pixels of the source image for the center of the button.
 
 `hitbox_type` describes which type of shape the button has. `radial` (circle, ellipsis) and `rect` (rectangular) shapes are supported.