diff --git a/src/simulator/machine.rs b/src/simulator/machine.rs
index ff4c0e0..a2c8046 100644
--- a/src/simulator/machine.rs
+++ b/src/simulator/machine.rs
@@ -109,6 +109,7 @@ pub struct Machine {
 
 impl Machine {
 
+	/// Machine constructor
 	pub fn init_machine() -> Machine {	
 		let mut shiftmask : [u64 ; 64] = [0 ; 64];
 		let mut value : u64 = 0xffffffff;
@@ -195,6 +196,11 @@ impl Machine {
 		};
 	}
 
+	/// Print the status of the machine to the standard output
+	/// 
+	/// ### Parameters
+	/// 
+	///  - **machine** the machine to get the status from
 	pub fn print_machine_status(machine: &mut Machine) {
 		println!("######### Machine status #########");
 		for i in (0..32).step_by(3) {
@@ -213,6 +219,11 @@ impl Machine {
 		println!("##################################");
 	}
 
+	/// Get the state of the registers as a string
+	/// 
+	/// ### Parameters
+	/// 
+	///  - **machine** the machine to read the registers from
 	pub fn string_registers(machine: &mut Machine) -> String {
 		let mut s = String::from("");
 		for i in 0..32 {
@@ -554,7 +565,8 @@ impl Machine {
 															} else {
 																machine.fp_reg.set_reg(inst.rd as usize, -local_float)
 															},
-										RISCV_FP_FSGN_JX => if (machine.fp_reg.get_reg(inst.rs2 as usize) < 0.0 && machine.fp_reg.get_reg(inst.rs1 as usize) >= 0.0) || (machine.fp_reg.get_reg(inst.rs2 as usize) >= 0.0 && machine.fp_reg.get_reg(inst.rs1 as usize) < 0.0) {
+										RISCV_FP_FSGN_JX => if (machine.fp_reg.get_reg(inst.rs2 as usize) < 0.0 && machine.fp_reg.get_reg(inst.rs1 as usize) >= 0.0) ||
+															   (machine.fp_reg.get_reg(inst.rs2 as usize) >= 0.0 && machine.fp_reg.get_reg(inst.rs1 as usize) < 0.0) {
 																machine.fp_reg.set_reg(inst.rd as usize, -local_float)
 															} else {
 																machine.fp_reg.set_reg(inst.rd as usize, local_float)
@@ -608,7 +620,7 @@ impl Machine {
 
 	/// print memory FOR DEBUG
 	/// 
-	/// "@"adresse [16 bytes]
+	/// "@"adress [16 bytes]
 	pub fn _print_memory(machine : &mut Machine, from: usize, to: usize) {
 		for i in from..to {
 			if i%16 == 0 {
@@ -619,18 +631,22 @@ impl Machine {
 		println!();
 	}
 
+	/// Get value from int register
 	pub fn read_int_register(&self, index: usize) -> i64 {
 		self.int_reg.get_reg(index)
 	}
 
+	/// Get value from float register
 	pub fn read_fp_register(&self, index: usize) -> f32 {
 		self.fp_reg.get_reg(index)
 	}
 
+	/// Write into int register
 	pub fn write_int_register(&mut self, index: usize, value: i64) {
 		self.int_reg.set_reg(index, value);
 	}
 	
+	/// Write info float register
 	pub fn write_fp_register(&mut self, index: usize, value: f32) {
 		self.fp_reg.set_reg(index, value);
 	}