diff --git a/spec.txt b/spec.txt
index 4d9e079..fa405f6 100644
--- a/spec.txt
+++ b/spec.txt
@@ -200,6 +200,7 @@ Function definition:
     foreign func powf(x: f32, y: f32) -> f32 // no implementation
 
 TODO: function overloading? Probably requires selecting a specific overload using `as` operator to save to a value (but not on call site)
+TODO: alternative - Rust-like traits? More powerful, but complicates the language
 
 ======== TYPE OF TYPES ========