Clarification on HPACK dynamic table size increases?

I'm working on implementing HPACK, wanted clarification on whether the
dynamic table can grow:

>From 4.2
> This mechanism can be used to completely clear entries from the dynamic table by setting a maximum size of 0, which can subsequently be restored.

However, 6.3 has a MUST that the table may only be reduced in size:
> The new maximum size MUST be lower than or equal to the last value of the maximum size of the dynamic table.


Regards,
Daurn.