How to increase WLS mem?

Hi, I need to increase java mem in AIS and JAS instance, I think to do from WLS, server start, arguments add -Xms32m -Xmx4096m and restart instance, but we have script to start services, so the question is, do I update the SetDomain file also?..so that script start instances wit take the new java mem 4096 value?

SetDomain:

do I need to increase to 4gb ram memory.

WLS_MEM_ARGS_64BIT="-Xms512m -Xmx512m"

export WLS_MEM_ARGS_64BIT

WLS_MEM_ARGS_32BIT="-Xms512m -Xmx512m"

export WLS_MEM_ARGS_32BIT

if [ "${JAVA_VENDOR}" != "HP" ] ; then