corrected usage information

.gitignore

@@ -1,3 +1,4 @@
 tests/**
 dst/**
 src/**
+rivet

rivet.sh

@@ -9,7 +9,7 @@ unset PRINT_HELP
 unset SKIP_SITEMAP
 
 usage() {
-	printf "Usage: rivet [-o destdir] [-hovelf] srcdir domain\n"
+	printf "Usage: rivet [-hovelfsu] [-p string] [-o destdir] srcdir domain\n"
 	printf "\t-h: prints this message\n"
 	printf "\t-o [destdir]: specifies the output direcotory to be [destdir]\n"
 	printf "\t-p: [string]: Rename the \"Pages\" section to [string]\n"