Maximum allowed RAM for Dell Inspiron 3420

Hi, 

Please help me in finding out the maximum allowed RAM for my Dell Inspiron 3420.

It has two RAM slots and currently I am having 2 GB in a slot and 4 GB in another.

I would like to upgrade to the maximum limit that my laptop can allow.

Any help would be appreciated.

Kind regards,

Mohamed Yosufdeen JMH