On 1 January 20X1, Zephal signs a 3-year maintenance contract for a transaction price of 900,000; the performance obligation is satisfied over time and evenly. At 31 December 20X1, Zephal has recognised revenue of 300,000 and expects to recognise 300,000 in 20X2 and 300,000 in 20X3. What information does Zephal give on the remaining performance obligations?