diff --git a/README b/README
index e8c7e895bd5f4c97cf259662bf2d1ab43617e5e8..d771bce3301555912c9e9a3b39673291e4488014 100644
--- a/README
+++ b/README
@@ -34,6 +34,12 @@ Beginnings of a PDF parser in Hammer
        # place some test files in the t/ directory...
        $ make test
 
+       # There are two optional parameters to specify strictness of the parser, and the lowest severity violation to output to stderr:
+       $ ./pdf <filename> 0 9
+       # At the time of writing, severity ratings of VIOL()s range between 1-9
+       # To silence (almost) all error messages, pass a number equal to or greater than 99999 as the fourth parameter:
+       $ ./pdf <filename> 0 99999
+
  - Troubleshooting:
 
        libhammer.so not found: