+.IP \-\-swap=SWAPSIZE
+If specified, create a swap partition of the given size within the image.
+Debootstrapping will fail if this results in a root partition which is
+too small for the selected packages. The minimum swap space is 256Mb as
+the default memory allocation of QEMU is 128Mb. A default 1Gb image is
+not likely to have enough space for a swap partition as well.