diff --git a/patator.py b/patator.py
index e6cc624..b27fc55 100755
--- a/patator.py
+++ b/patator.py
@@ -238,7 +238,12 @@ www.abc.fr 8.8.8.8
 www.xyz.fr 8.8.4.4
 
 The numbers of every keyword given on the command line must be specified.
-Use ',' to iterate over the cartesian product of sets and use ':' to iterate over sets simultaneously.
+Use ',' to iterate over the cartesian product of sets and use ':' to iterate
+over sets simultaneously.
+
+If the value of a module option starts with the letter @, the rest should be a
+filename. The contents of the file will be loaded into the option:
+./module raw_request=@req.txt 0=vhosts.txt 1=uagents
 
 * Keywords