mrxvt transparency behaves opposite to what is documented

[Disc Magnet <discmagnet@gmail.com>]

The man page says:

         Ctrl+Shift+j        Change shading of terminal to make it
more transparent.
         Ctrl+Shift+k        Change shading of terminal to make it
less transparent.

But when I press ctrl+shift+j it decreases transparency.

Could you please confim this behavior?

I am using mrxvt on Wheezy.