Doubt on it return

Respected sir Iam a pensioner .During last financial year(2014-15) I was working as lecturer in a private college Pension & salary of the lectureship was together booked under sec 192 and shown as salary and that was 7.6 lakhs per annum.This finanancial year(2015-16) I have only pension against salary (ie) 3.6 only. Iwant to know whether INCOME TAX DEPARTMENT will ask the reason for reduction in salary ?Should I be asked to give documental proof by assessing officer