diff --git a/infernal b/infernal
new file mode 120000
index 0000000..798d0f3
--- /dev/null
+++ b/infernal
@@ -0,0 +1 @@
+./main.py
\ No newline at end of file
diff --git a/infernal.py b/main.py
old mode 100644
new mode 100755
similarity index 87%
rename from infernal.py
rename to main.py
index 9fd8599..6668d3d
--- a/infernal.py
+++ b/main.py
@@ -1,3 +1,4 @@
+#!/usr/bin/python2
 
 import sys
 
@@ -13,16 +14,21 @@ def parse_args ():
 	parser.add_argument('-i', '--input-file', default='-', help = '.S file to use as input', dest = 'input-file')
 	parser.add_argument('-o', '--output-file', default='-', help = '.S file to use as output', dest = 'output-file')
 	for register in REGISTERS:
-		parser.add_argument('--'+register[1:], nargs = 1, type = int, default = [Junk.Junk()], dest = register)
+		parser.add_argument('--'+register[1:], nargs = 1, type = int, default = None, dest = register, help = 'the initial value of the register')
 	args = vars(parser.parse_args())
 
 	# Determine args #
 	registers_init = {}
 	for register in REGISTERS:
-		registers_init[register[1:]] = args[register][0]
+		registers_init[register[1:]] = Junk.Junk('prev '+register)
+	#
 	registers_init['rip'] = 0
 	registers_init['rsp'] = 0
 	registers_init['rbp'] = Junk.Junk('old bp')
+	#
+	for register in REGISTERS:
+		if args[register]:
+			registers_init[register[1:]] = args[register][0]
 
 	#
 	program = ""