BIP101 - Increase to 8 MB on January 11, 2016, and double the limit every two years (Bitcoin XT)
Might I suggest:
BIP101 - Continuously raise the limit from 8MB on January 11, 2016 so that the limit is doubled every two years (Bitcoin XT).
"double the limit every two years" makes it sound like the limit will stay at 8MB for two years and then jump suddenly to 16MB.