updated README

README.md

@@ -17,25 +17,21 @@ Package that provides all mirrors for Manjaro Linux.
 - A GUI for selecting the mirrors to used to generate a custom list.
 
 ### How does fasttrack work
+First of all, a working internet connection is mandatory. Pacman-Mirrors always checks if network is online. It is doing so by pinging google with 3 packets.
 #### Question:
 So, `pacman-mirrors -f 2` takes the same time to create `/etc/pacman.d/mirrorlist` as `pacman-mirrors -f 20`?
-
 ##### Answer:
 No. `pacman-mirors -f 2` will be faster than `pacman-mirrors -f 20` since only 2 mirrors are probed vs 20 mirrors but since most mirrors respond within the first second I think it is barely noticeable.
-
 #### Question:
-`pacman-mirrors -f` always ranks ALL mirrors by response time (the same as `pacman-mirrors -g` does) and additionally takes up-to-date mirrors and writes only **n** mirrors to `/etc/pacman.d/mirrorlist`?
-
+`pacman-mirrors -f n` always ranks ALL mirrors by response time (the same as `pacman-mirrors -g` does) and additionally takes up-to-date mirrors and writes only **n** mirrors to `/etc/pacman.d/mirrorlist`?
 ##### Answer: 
-No. `pacman-mirrors -f N` always ranks by response time but before the actual ranking, the mirrors are sorted so it will be the first **n** mirrors which are uptodate which are actually probed, not mirrors which is not uptodate
-
+No. `pacman-mirrors -f n` ranks on a sorted list with known up-to-date mirrors. Thus it is only the first **n** mirrors from this list which are actually probed. If you have a list of 30 mirrors which are uptodate and use `-f 5` only the top 5 mirrors are probed and then sorted after response time.
+The switch does not guarantee you get **the n** fastest mirrors only that they are responsive and uptodate. Mirrors which have network errors or times out are not considered at all.
 #### Beware
 The smaller number you choose to write to the mirrorlist will increase the possibility of not getting a responsive mirror since only the first **n** in the list are tested not all of them.
 
 A reasonable number is between 5 and 10.
 
-There is a little overhead because it always checks if network is online. Doing so by pinging google with 3 packets.
-
 The force of this approach is that we know forehand if the mirror is uptodate and thus only have to rank **n** mirrors from the mirrors known to be uptodate.
 
 If you need a complete ranking then `pacman-mirrors -g` is the way to go.