diff --git a/src/main.rs b/src/main.rs
index cc181fe..9fe5976 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,6 +17,7 @@ use kernel::system::System;
 use simulator::machine::Machine;
 
 fn main() {
-    let machine = Machine::init_machine();
+    let mut machine = Machine::init_machine();
     let system = System::default();
+    machine.run()
 }
diff --git a/src/simulator/machine.rs b/src/simulator/machine.rs
index 2048455..fdb9b0f 100644
--- a/src/simulator/machine.rs
+++ b/src/simulator/machine.rs
@@ -13,7 +13,7 @@
 
 use std::{
 	io::Write,
-	fs::File, ops::Add
+	fs::File
 };
 use crate::simulator::{
 	print,
@@ -24,7 +24,10 @@ use crate::simulator::{
 	register::*
 };
 
-/// Exceptions
+/// # Exceptions
+/// 
+/// Textual names of the exceptions that can be generated by user program
+/// execution, for debugging purpose.
 /// todo: is this really supposed to stand in machine.rs?
 pub enum ExceptionType {
 	/// Everything ok
@@ -46,6 +49,7 @@ pub enum ExceptionType {
 	NumExceptionTypes
 }
 
+/// ID of the stack register
 pub const STACK_REG: usize = 2;
 /// Number of available Integer registers
 pub const NUM_INT_REGS: usize = 32;
@@ -154,7 +158,7 @@ impl Machine {
 	/// ### Parameters
 	/// 
 	///  - **machine** contains the memory
-	pub fn extract_memory(&self){
+	pub fn _extract_memory(&self){
 		let file_path = "burritos_memory.txt";
 		let write_to_file = |path| -> std::io::Result<File> {
 			let mut file = File::create(path)?;
@@ -228,8 +232,8 @@ impl Machine {
 			panic!("ERROR : number max of instructions rushed");
 		}
 		let mut val: [u8; 4] = [0; 4];
-		for i in 0..4 {
-			val[i] = self.main_memory[self.pc as usize + i];
+		for (i, elem) in val.iter_mut().enumerate() {
+			*elem = self.main_memory[self.pc as usize + i];
 		}
 		
 		let val = u32::from_be_bytes(val) as u64;