@subsection length
The number of bits in the field. The field must be contiguous. For
non-contiguous instruction fields use "multi-ifields"
-(@pxref{Non-contiguous fields}).
+(@xref{Instruction fields}).
@subsection follows
Optional. Experimental.
would never have an invalid value, though certainly one could provide an
error case if one wanted to.
-@node Non-contiguous fields
@subsection Non-contiguous fields
@cindex Fields, non-contiguous