diff --git a/scripts/encode4mmp b/scripts/encode4mmp
index 599c2b0..891a3f6 100755
--- a/scripts/encode4mmp
+++ b/scripts/encode4mmp
@@ -1,5 +1,8 @@
-# A script to convert files to a "safe" format suitable for MapMap.
 #!/bin/sh
+# A script to convert files to a "safe" format suitable for MapMap.
+# It supports either one of these options:
+# 1) <input> <output>
+# 2) -m _result.mov *.{mov,mp4}
 
 FORMAT="mjpeg"
 if [ $# -lt 2 ];