what does 'M' stand for in Update behaviour

[baja]

Hi,

I had checked out a file. I have done some changes to it.
which i want to checkin.

While I did update on this file

cvs -z9 update -r branch abc.cpp

I am getting message in Purple color

M abc.cpp

Does it mean that I need to merge my changes with the server copy?
Or should i directly chkecin the code in the branch. 

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