diff --git a/btrfsctl.c b/btrfsctl.c
index 66c4e89..e37e2e3 100644
--- a/btrfsctl.c
+++ b/btrfsctl.c
@@ -46,7 +46,7 @@ static inline int ioctl(int fd, int define, void *arg) { return 0; }
 static void print_usage(void)
 {
 	printf("usage: btrfsctl [ -d file|dir] [ -s snap_name subvol|tree ]\n");
-	printf("                [-r size] [-A device] [-a] [-c] [-D dir .]\n");
+	printf("                [-r size] [-A device] [-a] [-c] [-D snap_name dir]\n");
 	printf("\t-d filename: defragments one file\n");
 	printf("\t-d directory: defragments the entire Btree\n");
 	printf("\t-s snap_name dir: creates a new snapshot of dir\n");
@@ -55,7 +55,7 @@ static void print_usage(void)
 	printf("\t-A device: scans the device file for a Btrfs filesystem\n");
 	printf("\t-a: scans all devices for Btrfs filesystems\n");
 	printf("\t-c: forces a single FS sync\n");
-	printf("\t-D: delete snapshot\n");
+	printf("\t-D: snap_name dir: delete named snapshot in directory dir\n");
 	printf("%s\n", BTRFS_BUILD_VERSION);
 	exit(1);
 }