diff --git a/creature.go b/creature.go
index 042c726..6dcf1c1 100644
--- a/creature.go
+++ b/creature.go
@@ -6,19 +6,19 @@ package creature
 type Machine struct {
 	// Program is not modified by the machine, and can be freely set before
 	// the machine is started.
-	Program   []int
-	
+	Program []int
+
 	stack     []int
 	block     []int
 	counter   int
 	pointer   int
-	functions map[int] MachineFunction
+	functions map[int]MachineFunction
 }
 
 // MachineFunction is a function that can extend the functionality of the stack
 // machine. It is passed a pointer to the machine that is calling it, and the
 // machine will halt execution if true is returned.
-type MachineFunction func (machine *Machine) (stop bool)
+type MachineFunction func(machine *Machine) (stop bool)
 
 // Error is an error type that can be returned from the machine's methods if
 // they experience problems.
@@ -31,7 +31,7 @@ const (
 )
 
 // Error returns a textual description of the error.
-func (err Error) Error () (description string) {
+func (err Error) Error() (description string) {
 	switch err {
 	case ErrorIDTaken:
 		description = "this ID is taken by another function"
@@ -42,15 +42,15 @@ func (err Error) Error () (description string) {
 
 // Reset resets the stack of the  machine. This should be called before Execute,
 // since Execute does not reset the stack.
-func (machine *Machine) Reset () {
-	machine.stack   = nil
+func (machine *Machine) Reset() {
+	machine.stack = nil
 	machine.pointer = 0
 }
 
 // Execute starts execution at the address specified by offset. The machine will
 // run until a HALT instruction is encountered, or the end of program memory is
 // reached.
-func (machine *Machine) Execute (offset int) {
+func (machine *Machine) Execute(offset int) {
 	machine.counter = offset
 
 	for machine.counter < len(machine.Program) {
@@ -58,88 +58,96 @@ func (machine *Machine) Execute (offset int) {
 		case 0x0:
 			// PUSH
 			// push the next word in program memory onto the stack
-			machine.counter ++
+			machine.counter++
 			machine.Push(machine.instruction())
-			
+
 		case 0x1:
 			// POP
 			// pop the top word off of the stack, and discard it
 			machine.Pop()
-			
+
 		case 0x2:
 			// LOAD
 			// push the word at an address onto the stack
 			machine.Push(machine.Peek(machine.Pop()))
-		
+
 		case 0x3:
 			// STOR
 			// store a word at an address
 			machine.Poke(machine.Pop(), machine.Pop())
-		
+
 		case 0x4:
 			// ADD
 			// adds the last two words on the stack
 			machine.Push(machine.Pop() + machine.Pop())
-			
+
 		case 0x5:
 			// SUB
 			// subtracts the second to last word on the stack from
 			// the last word on the stack
 			machine.Push(machine.Pop() - machine.Pop())
-			
+
 		case 0x6:
 			// MUL
 			// multiplies the last two words on the stack
 			machine.Push(machine.Pop() * machine.Pop())
-			
+
 		case 0x7:
 			// DIV
 			// divides the last word on the stack by the second to
 			// last word on the stack
 			machine.Push(machine.Pop() / machine.Pop())
-			
+
 		case 0x8:
 			// EQ
 			// checks if the last two words on the stack are equal
 			equal := 0
-			if machine.Pop() == machine.Pop() { equal = 1 }
+			if machine.Pop() == machine.Pop() {
+				equal = 1
+			}
 			machine.Push(equal)
-		
+
 		case 0x9:
 			// GT
 			// checks if the last word on the stack is greater than
 			// the second to last word on the stack
 			greater := 0
-			if machine.Pop() > machine.Pop() { greater = 1 }
+			if machine.Pop() > machine.Pop() {
+				greater = 1
+			}
 			machine.Push(greater)
-		
+
 		case 0xa:
 			// LT
 			// checks if the last word on the stack is less than the
 			// second to last word on the stack
 			less := 0
-			if machine.Pop() > machine.Pop() { less = 1 }
+			if machine.Pop() > machine.Pop() {
+				less = 1
+			}
 			machine.Push(less)
-			
+
 		case 0xb:
 			// NEQ
 			// checks if the last two words on the stack are not
 			// equal
 			notEqual := 0
-			if machine.Pop() != machine.Pop() { notEqual = 1 }
+			if machine.Pop() != machine.Pop() {
+				notEqual = 1
+			}
 			machine.Push(notEqual)
-			
+
 		case 0xc:
 			// MOD
 			// performs a modulo operation of the second to last
 			// word on the stack to the last word on the stack
 			machine.Push(machine.Pop() % machine.Pop())
-			
+
 		case 0xd:
 			// HALT
 			// stops execution
 			return
-			
+
 		case 0xe:
 			// JMP
 			// jump to the address specified by the last word on the
@@ -149,25 +157,27 @@ func (machine *Machine) Execute (offset int) {
 			if machine.Pop() != 0 {
 				machine.counter = jumpTo - 1
 			}
-		
+
 		case 0xf:
 			// CAL
 			// call an implementation-defined subroutine, with the
 			// id specified by the last word on the stack. this may
 			// push and pop various things from the stack
 			id := machine.Pop()
-			if machine.functions == nil { break }
+			if machine.functions == nil {
+				break
+			}
 			function, exists := machine.functions[id]
 			if exists {
 				function(machine)
 			}
 		}
-		machine.counter ++
+		machine.counter++
 	}
 }
 
 // Instruction returns the current instruction in program memory.
-func (machine *Machine) instruction () (instruction int) {
+func (machine *Machine) instruction() (instruction int) {
 	instruction = machine.Program[machine.counter]
 	return
 }
@@ -175,16 +185,16 @@ func (machine *Machine) instruction () (instruction int) {
 // reallocateStack changes the size of the stack to something reasonable. This
 // should be called then the stack pointer is really small compared to the
 // actual stack size, or the stack pointer is bigger than the stack.
-func (machine *Machine) reallocateStack () {
-	reallocatedStack := make([]int, machine.pointer * 3 / 2)
+func (machine *Machine) reallocateStack() {
+	reallocatedStack := make([]int, machine.pointer*3/2)
 	copy(reallocatedStack, machine.stack)
 	machine.stack = reallocatedStack
 }
 
 // Push pushes a word onto the stack, increasing the stack pointer and
 // reallocating the stack if necessary.
-func (machine *Machine) Push (word int) {
-	machine.pointer ++
+func (machine *Machine) Push(word int) {
+	machine.pointer++
 	if len(machine.stack) <= machine.pointer {
 		machine.reallocateStack()
 	}
@@ -192,29 +202,29 @@ func (machine *Machine) Push (word int) {
 
 // Pop pops the last word off of the stack, and returns it, decreasing the stack
 // pointer and reallocating the stack if necessary.
-func (machine *Machine) Pop () (word int) {
+func (machine *Machine) Pop() (word int) {
 	word = machine.stack[machine.pointer]
-	machine.pointer --
+	machine.pointer--
 
-	if machine.pointer < len(machine.stack) / 3 {
+	if machine.pointer < len(machine.stack)/3 {
 		machine.reallocateStack()
 	}
-	
+
 	return
 }
 
-// Peek returns the word at address in the block
-func (machine *Machine) Peek (address int) (word int) {
+// Peek returns the word at address in the block.
+func (machine *Machine) Peek(address int) (word int) {
 	if address < len(machine.block) {
 		word = machine.block[address]
 	}
 	return
 }
 
-// Poke sets the value at address in the block to word
-func (machine *Machine) Poke (address int, word int) {
+// Poke sets the value at address in the block to word.
+func (machine *Machine) Poke(address int, word int) {
 	if address >= len(machine.block) {
-		reallocatedBlock := make([]int, address * 3 / 2)
+		reallocatedBlock := make([]int, address*3/2)
 		copy(reallocatedBlock, machine.block)
 		machine.block = reallocatedBlock
 	}
@@ -222,9 +232,9 @@ func (machine *Machine) Poke (address int, word int) {
 
 // Register registers a function at the specified ID. If there is already a
 // function registered at that ID, this method will return an error.
-func (machine *Machine) Register (id int, function MachineFunction) (err error) {
+func (machine *Machine) Register(id int, function MachineFunction) (err error) {
 	if machine.functions == nil {
-		machine.functions = make(map[int] MachineFunction)
+		machine.functions = make(map[int]MachineFunction)
 	}
 
 	_, exists := machine.functions[id]
@@ -239,16 +249,18 @@ func (machine *Machine) Register (id int, function MachineFunction) (err error)
 }
 
 // Unregister removes a function that is registered at the specified ID.
-func (machine *Machine) Unregister (id int) {
-	if machine.functions == nil { return }
+func (machine *Machine) Unregister(id int) {
+	if machine.functions == nil {
+		return
+	}
 	delete(machine.functions, id)
 }
 
 // LoadMemory loads the contents of block into the machine's memory.
-func (machine *Machine) LoadMemory (block []int) {
+func (machine *Machine) LoadMemory(block []int) {
 	machine.block = make([]int, len(block))
 	copy(machine.block, block)
 }
 
-// Milk milks the stack machine
-func (machine *Machine) Milk () {}
+// Milk milks the stack machine.
+func (machine *Machine) Milk() {}