Matching the NMR to a compound I was given a molecule that I had to identify the NMR of. The molecule is 2-methylpent-1-ene (shown below): 



The correct NMR spectra for this molecule is: 


My question is, why is this the right spectra for this molecule. Particularly, how and why did the single peak come up? As far as I know, the only two single peaks are the two that are downfield (aka closest to the $\ce{sp2}$ hybridized carbon).
If you look at the structure closely, you'll find that there are no Hydrogens on the C with the double bond attached. Adjacent to this C is the methyl group. Due to the n+1 rule, the singlet should be due to that Methyl group connected to the "Hydrogenless" Carbon. Hope this simplified answer helps