diff --git a/src/intro/hello-world.md b/src/intro/hello-world.md
index a59a36f..2474596 100644
--- a/src/intro/hello-world.md
+++ b/src/intro/hello-world.md
@@ -264,7 +264,9 @@ Rust does not natively support inheritance, but the gdext API emulates it to a c
 
 ### Class declaration
 
-In this example, we declare a class called `Player`, which inherits [`Sprite2D`][api-class-sprite2d] (a node type):
+In this example, we declare a class called `Player`, which inherits `Sprite2D` (a node type).
+This can be either defined in `lib.rs` or in a separate file `player.rs`.
+In case you go for the latter, don't forget to declare `mod player;` in your `lib.rs` file.
 
 ```rust
 use godot::prelude::*;