diff --git a/content/en/usage/usage.md b/content/en/usage/usage.md
index 0683259..da3e34d 100644
--- a/content/en/usage/usage.md
+++ b/content/en/usage/usage.md
@@ -349,7 +349,8 @@ Use: `M-x toggle-frame-fullscreen`
 
 Set a transparent background with this line in your init file:
 
-    (sdl2-ffi.functions:sdl-set-window-opacity (lem-sdl2::display-window lem-sdl2::*display*) 0.9)
+    (sdl2-ffi.functions:sdl-set-window-opacity (lem-sdl2/display::display-window lem-sdl2/display::*display*) 0.9)
+
 
 ### Font size (SDL2 only)