integer

    An integer in the range 0 to 9. The location counter is aligned
    at an address that is the value of 2 raised to the power of the
    integer.

 keyword

    One of five keywords that specify the alignment boundary. The
    location counter is aligned to an address that is the next
    multiple of the following values:

    Keyword  Size (in Bytes)

    BYTE     20= 1
    WORD     21= 2
    LONG     22= 4
    QUAD     23= 8
    OCTA     24= 16

 [,fill-specifier]

    Any expression that resolves to an assembly-time integer value
    containing no forward references. The filling is done per byte,
    regardless of the alignment. If the value you specify is not in
    the range of 0 to 255, the assembler issues a diagnostic message
    and truncates the value.