CC Ādi 13.49

grantha-vistāra-bhaye chāḍilā ye ye sthāna
sei sei sthāne kichu kariba vyākhyāna
Word for word: 
grantha — of the book; vistāra — of expansion; bhaye — being afraid; chāḍilā — gave up; ye ye sthāna — which different places; sei sei sthāne — in those places; kichu — something; kariba — I shall make; vyākhyāna — description.
Translation: 
Being afraid of his book’s becoming too voluminous, he left some places without vivid descriptions. I shall try to fill those places as far as possible.