What does this mean in this pattern?

I’m knitting the sweater that I said I must knit before. It’s this one:

In the directions for the back and front part (it’s knitted in the round) on the 5th line it says “arrow applies to sleeve only”. what does that mean? it’s in reference to the chart for the pattern, but I don’t get it. Doesn’t the work go in the direction of the arrow on the body, too?

At the same time when the piece measures 15 cm knit M.1 - make sure the repeat is placed at the top of the sleeve (see the arrow in the diagram which marks the centre), include the inc sts in the pattern – make sure that the pattern in not displaced! When the piece measures 46-45-45-45-44 cm cast off 8 sts underneath the sleeve = 54-57-61-63-67 sts. Put the piece aside and knit another sleeve.

The arrow marks the center of the sleeve so it will line up properly to match when you connect the sleeves to the body, I imagine.

Thanks, Ingrid. I had just decided, hey, why not read through the sleeve directions and found this: “M.1 - make sure the repeat is placed at the top of the sleeve (see the arrow in the diagram which marks the centre)”. Thanks, again, that is exactly what it means.