help needed

I included video link i'm trying to follow

Dont understand multiples of 15 plus 4
if i want to widen pattern how do i work out

http://www.youtube.com/watch?v=JqDJfJiDRuo&NR=1&feature=fvwp

Forums: 

I am not on high speed so Youtube is a problem for me. However, if you want to widen your pattern, a multiple gives you the option. For example, if they are saying multiple of 15, your end count (excluding the 4, I will get to that in a minute) would have to be divisible by 15. Example you would chain 15, 30, or 45, or 60, etc, however wide you want it to be. Then add 4 chains at the end. This will be the only time you will do that. This gives you the amount needed to follow the pattern instructions. Hope this helps.

LI Roe

Thank you.. now I understand