Alienware m15 (2018) possible to add more RAM?

So, I'm new to Alienware. In fact I haven't even received my laptop yet but I purchased the 2018 variation of the m15 w/ 8 GB DDR4. 

I unfortunately did not have enough money at the time to get extra RAM, but I should be coming into a little extra soon & am looking into upgrading the laptop in terms of memory. Is this possible? And if so, is there a specific type I would need to buy? I want to upgrade to 16 GB next month but before I do anything dumb I'd love the communities input.

Thanks ahead of time!!