diff --git a/fibs.asm b/fibs.asm
new file mode 100644
index 0000000..4080a40
--- /dev/null
+++ b/fibs.asm
@@ -0,0 +1,22 @@
+        .data 0x200
+
+fibs:   .space 56
+
+        .text
+main:
+        addi s1, zero, 0     # storage index
+        addi s2, zero, 56    # last storage index
+        addi t0, zero, 1     # t0 = F_{i}
+        addi t1, zero, 1     # t1 = F_{i+1}
+loop:
+        sw  t0, fibs(s1)     # save
+        add t2, t1, t0       # t2 = F_{i+2}
+        addi t0, t1, 0       # t0 = t1
+        addi t1, t2, 0       # t1 = t2
+        addi s1, s1, 4       # increment storage pointer
+        blt s1, s2, loop     # loop as long as we did not reach array length
+        # exit gracefully
+        addi a0, zero, 0
+        addi a7, zero, 93
+        ebreak               # launch debugger
+        scall                # exit with code 0
\ No newline at end of file
diff --git a/riscemu/main.py b/riscemu/__main__.py
similarity index 62%
rename from riscemu/main.py
rename to riscemu/__main__.py
index f3c53f1..808b0ad 100644
--- a/riscemu/main.py
+++ b/riscemu/__main__.py
@@ -3,24 +3,27 @@ if __name__ == '__main__':
     from .helpers import *
     import argparse
 
-    parser = argparse.ArgumentParser(description='RISC-V Userspace parser and emulator')
+    parser = argparse.ArgumentParser(description='RISC-V Userspace parser and emulator', prog='riscemu')
     parser.add_argument('file', metavar='file.asm', type=str, help='The assembly file to interpret and run')
 
     # RunConfig parameters
-    parser.add_argument('color', type=bool, help='Colored output', default=True)
-    parser.add_argument('default_stack_size', type=int, help='Default stack size of loaded programs', default=None,
-                        metavar='default-stack-size')
-    parser.add_argument('debug_instruction', type=bool, default=True, metavar='debug-instruction',
+    parser.add_argument('--no-color', type=bool, help='no colored output', default=False,
+                        nargs='?')
+    parser.add_argument('--default_stack_size', type=int, help='Default stack size of loaded programs', default=None,
+                        metavar='default-stack-size', nargs='?')
+    parser.add_argument('--debug_instruction', type=bool, default=True, metavar='debug-instruction',
                         help='Switches to an interactive python interpreter when ebreak/sbreak instruction '
-                             'is encountered. Otherwise these instructions are treated as nop.')
+                             'is encountered. Otherwise these instructions are treated as nop.', nargs='?')
 
-    parser.add_argument('print_tokens', metavar='print-tokens', type=bool, help='Print tokens after tokenization',
-                        default=False)
+    parser.add_argument('--print_tokens', metavar='print-tokens', type=bool, help='Print tokens after tokenization',
+                        default=False, nargs='?')
 
     args = parser.parse_args()
 
+    print(args)
+
     cfg = RunConfig(
-        color=args.color,
+        color=not args.no_color,
         preffered_stack_size=args.default_stack_size,
         debug_instruction=args.debug_instruction
     )