(mh)show sometimes does not display part information

Hello,

I have the following in ~/.mh_profile:

showproc: mhshow
mhshow: -concat -prefer text/plain

If  the part  that I'm  viewing  is text  plain,  I'll see  a line  that
describes it before it dumps the part to my pager:

[ part  - text/plain -   2.7KB  ]

But when I'm viewing a text/html part,  it doesn't print that at all. Is
there some way I can have it print which part it is displaying always?

Thanks,

Andy