diff --git a/examples/sdl/src/util.rs b/examples/sdl/src/util.rs
index 2f613a9def6b695b28513f082ddb3c58318333ad..a2adbb8cc3e15c503d081203bb6ae5b967bba174 100644
--- a/examples/sdl/src/util.rs
+++ b/examples/sdl/src/util.rs
@@ -3,6 +3,9 @@ use sdl2::{
     AudioSubsystem, EventPump, TimerSubsystem, VideoSubsystem,
 };
 
+/// Structure that provide the complete set of Graphics
+/// and Sound syb-system ready to be used by the overall
+/// emulator infrastructure.
 pub struct Graphics {
     pub canvas: Canvas<Window>,
     pub video_subsystem: VideoSubsystem,