What is the "M" on this file in Xcode? -

this question has answer here:

• what “m” , “a” icons in project navigator of xcode 4 mean when create new project? 10 answers

these 2 "m" next file names, for? how rid of it? need it?

that's git working.

the file has been modified. if right click file => source control => commit selected files... can commit changes git.

i recommend learn little bit of git, great.