What does a status of "P" mean during a Tortoise CVS Update operation?

I ran an "Update" command on a folder with TortoiseCVS and one of the file statuses is "P". What does that mean? I see "U" which I'm assuming means "Update" and "M" which I'm assuming means "Merge". I tried to open the help file but I'm just getting 404s, so I think the firewall at my office is blocking the help contents...

Here's a screenshot of what I'm seeing:
_{(source: chomperstomp.com)}

It's equivalent to a 'U', but CVS figured that sending a patch rather than the whole updated file would be smaller.

I couldn't quickly find a fuller explanation, but here's a table of codes:

Code  Meaning     Description

?     what?       It's not a file in CVS. CVS knows nothing about this file

A     Added       This is a file you just added to CVS but not yet committed.
                  You have to commit it before others can see it.

C     Conflicted  A Conflict occurred when you did CVS update.
                  The conflicted lines are marked with special
                  characters and you need to manually resolve
                  the conflicts.

M     Modified    You have modified this file.
                  It's different from what's in CVS and you need to
                  commit (check in) the file to persist your changes in CVS.

P     Patched     This file was patched when you did CVS update.
                  The effect is the same as U (update),
                  but the changes were so small that CVS decided
                  to send a patch (P) instead of a whole file (U).

U     Updated     This file was updated when you ran CVS update.
                  It could be a file that already existed on the local drive,
                  or a new file brought down from the CVS repository.

R     Removed     You asked CVS to remove this file but you haven't
                  committed the removal.