My son wants to add 8G of ram to his Aspire E15 (E5-571-39S2). Can't find slot info about this make.

Hi there. Can any one tell me how many memory slots the Aspire E15 (E5-571-39S2) has as I can't find any information for that model. I know it's a relatively old one but I need to know if it will take another 8G RAM. Any info would be appreciated. Thanks.