diff --git a/mspconvert.py b/mspconvert.py
index 7a5b13d..9b68cc3 100755
--- a/mspconvert.py
+++ b/mspconvert.py
@@ -8,19 +8,24 @@
 import sys
 
 print("MS Paint file converter utility v0.1")
-print("Written by A.M. Rowsell, MPL Version 2.0 license\n\n")
-if len(sys.argv) < 1:
+print("Written by A.M. Rowsell, MPL Version 2.0 license\n")
+if len(sys.argv) < 2:
     print("Please provide filename (without extension)!")
+    print("Example usage:\n./mspconvert.py DONUT")
+    sys.exit(255)
 
 filename = sys.argv[1]
 width = 0
 height = 0
+# The output file follows the very simple XBM format
+# which is just a basic C syntax array variable
 outputString = '''
 #define {0}_width {1}
 #define {0}_height {2}
 static unsigned char {0}_bits [] =
 '''
 
+# Output data starts as an empty bytearray
 outputData = b''
 
 try: