On small plots, as long as you don't follow one thing with exactly the same thing the next year, it's ok.
so if you filled beds like this -
1, Brassicas,
2, onions,
3, root veg
4, brassicas
5, root veg,
and they all moved up one bed in the following year that would be ok.
If you have any beds with other crops in to add in to the rotation, eg bean/pea/salads, then all to the good