This class of reconciling item represents the change in liabilities related to operating activities. If the balance of liabilities increased from the balance reported at the end of the previous fiscal year, the difference is added to operating income to reconcile net cash flows from operating activities.
The reason behind adding a positive change is as follows:
By the same logic, a decrease in liabilities represents a cash outflow (payment) greater than the expense recognized in the calculation of operating income on the operating statement.