1 files changed, 6 insertions, 0 deletions
diff --git a/write-brlyt.py b/write-brlyt.py
index 3ff94bc..b0119bb 100644
--- a/write-brlyt.py
+++ b/write-brlyt.py
@@ -1,6 +1,12 @@
 import sys, struct, re, random
 from ethyl import *
 
+if len(sys.argv) != 2:
+    print 'Usage: python write-brlyt.py input.rlyt.py output.brlyt'
+    print '(for example, see test.rlyt.py)'
+    sys.exit(1)
+
+
 f = open(sys.argv[1], 'r')
 chunks = eval(f.read())
 f.close()