acer aspire es1-571-p1vn ram upgrade

Hi 

New to the Forums and just purchased the acer aspire es1-571-p1vn laptop and pleased with it.  Though in the near future I am looking at upgrading the ram and HD to SSD.  Can someone advise with regards to the RAM upgrade. 

Crucial's memory tool suggest (Crucial 4GB DDR3L-1600 SODIMM  DDR3 PC3-12800 • CL=11 • Unbuffered • NON-ECC • DDR3-1600 • 1.35V)  As I understand it has a max ram of 8GB.

Thanks in advance.

p.s. I take any upgrade would invalidate any warranty?

Chris