1 files changed, 5 insertions, 2 deletions
diff --git a/fix-layer-4.py b/fix-layer-4.py
index 59f7a1f..78f851c 100755
--- a/fix-layer-4.py
+++ b/fix-layer-4.py
@@ -9,7 +9,7 @@ lines had to be removed and zone clearances adjusted to create the same result.
 
 Compare with
 
-  $ gerbv 'Cryptech Alpha-In4.Cu.gbr' CrypTech.GP3
+  $ gerbv 'rev03-KiCad/GerberOutput/Cryptech Alpha-In4.Cu.gbr' /path/to/CrypTech.GP3
 
 """
 
@@ -103,7 +103,10 @@ def main(in_fn='rev03-KiCad/convert.kicad_pcb', out_fn='rev03-KiCad/Cryptech Alp
 
 if __name__ == '__main__':
     try:
-        res = main()
+        if len(sys.argv) != 3:
+            sys.stderr.write('Syntax: fix-layer-4.py infile.kicad_pcb outfile.kicad_pcb\n')
+            sys.exit(1)
+        res = main(sys.argv[1], sys.argv[2])
         if res:
             sys.exit(0)
         sys.exit(1)