[R-pkg-devel] 'library' or 'require' call not declared

[Richard M. Heiberger]

I don't understand what this message means

Flavor: r-devel-linux-x86_64-debian-gcc
Check: for unstated dependencies in 'demo', Result: NOTE
 'library' or 'require' call not declared from: 'MASS'

it is coming from HH_3.1-53.tar.gz that I sent in this evening.
It is also visible for HH_3.1-52.tar.gz on the CRAN package check page