diff --git a/fsck/main.c b/fsck/main.c
index 6edc902e..c13e2873 100644
--- a/fsck/main.c
+++ b/fsck/main.c
@@ -97,6 +97,11 @@ void dump_usage()
 	MSG(0, "  -S sparse_mode\n");
 	MSG(0, "  -a [SSA dump segno from #1~#2 (decimal), for all 0~-1]\n");
 	MSG(0, "  -b blk_addr (in 4KB)\n");
+	MSG(0, "  -r dump out from the root inode\n");
+	MSG(0, "  -f do not prompt before dumping\n");
+	MSG(0, "  -y alias for -f\n");
+	MSG(0, "  -o dump inodes to the given path\n");
+	MSG(0, "  -P preserve mode/owner/group for dumped inode\n");
 	MSG(0, "  -V print the version number and exit\n");
 
 	exit(1);