Magic Missile errata?

The description for magic missile says that you get an extra 2 missiles for every 5 levels after 1st, but then says at 6th you get 3 missiles and then a maximum of 5 at 13th.

Is that supposed to be 5 missiles at 11th level, or 1 extra every 3 levels (which would give 5 at 13th level)?

I can’t see this on the errata?