diff --git a/modules/programs/waybar.nix b/modules/programs/waybar.nix
index 2239fe5ef..486b29171 100644
--- a/modules/programs/waybar.nix
+++ b/modules/programs/waybar.nix
@@ -25,7 +25,7 @@ let
 
       options = {
         layer = mkOption {
-          type = nullOr (enum [ "top" "bottom" ]);
+          type = nullOr (enum [ "top" "bottom" "overlay" ]);
           default = null;
           description = ''
             Decide if the bar is displayed in front (`"top"`)