Bhashya
अथातः अनन्तरं व्रतमीमांसा उपासनकर्मविचारणेत्यर्थः ;
In plain words
Now follows the inquiry into the vow, which means the examination of the acts of meditation.
Close to the Sanskrit
Now therefore subsequently, the inquiry into the vow; this means the deliberation upon the action of meditation.