The following are the major changes:
- Addition: Common Swift – First record of a single bird on 9 October 2020 at Jelutong Tower, Central Catchment Nature Reserve. Second record of a single bird on 27 October 2020 at Henderson Waves.
- Addition: Hair-crested Drongo: – First record of a single bird seen at Changi Business Park on 26 November 2019.
- Taxonomic change: Resequence Family Anatidae (Ducks, Geese, Swans) to come before Family Phasianidae (Pheasants & Allies) in accordance to standard sequencing protocol adopted elsewhere.