update manual

Author: rpearce

bashcards.8

@@ -4,15 +4,17 @@
 .SH NAME
 bashcards \- Practice flashcards in bash
 .SH SYNOPSIS
-bashcards [-d directory]
+bashcards [-d directory] [-h|--help]
 .SH DESCRIPTION
 bashcards is a bash program for practicing flashcards in bash.
 .SH OPTIONS
 .TP
-.BR -d
+.BR -d, --dir
 Directory containing bashcard files (*.bcrds). Each file should contain a group
 of bashcards (one per line) formatted as front=back. If not provided, default
 bashcard values will be used.
+.BR -h, --help
+See this help information
 .SH BUGS
 No known bugs.
 .SH AUTHOR