Update documentation, standard input is expected to be in binary format too
CLA: trivial
@@ -35,8 +35,7 @@ Print a usage message.
Input filename to calculate a MAC for, or standard input by default.
Standard input is used if the filename is '-'.
-Files are expected to be in binary format, standard input uses hexadecimal text
-format.
+Files and standard input are expected to be in binary format.
=item B<-out> I<filename>
