Add missing option type

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/parse.c b/parse.c
index db2f5a4..bb138e5 100644
--- a/parse.c
+++ b/parse.c
@@ -79,6 +79,7 @@
 	const char *typehelp[] = {
 		"invalid",
 		"string (opt=bla)",
+		"string (opt=bla)",
 		"string with possible k/m/g postfix (opt=4k)",
 		"string with time postfix (opt=10s)",
 		"string (opt=bla)",