diff --git a/src/simulator/register.rs b/src/simulator/register.rs
index 339c0e5..bbad262 100644
--- a/src/simulator/register.rs
+++ b/src/simulator/register.rs
@@ -6,6 +6,14 @@
 use crate::simulator::machine::{NUM_FP_REGS, NUM_INT_REGS};
 use std::ops::{Add,  Sub};
 
+/// Forcing the Register struct's generic type into having the following Traits
+/// 
+///  - Add
+///  - Sub
+///  - PartialEq
+///  - Copy
+/// 
+/// Generally speaking, only numbers have the combinaison of these traits.
 pub trait RegisterNum: Add<Output=Self> + Sub<Output=Self> + PartialEq + Copy {}
 
 impl RegisterNum for i64 {}