Hello Ziyadatul Hikmah, I wanted to reach out about a specific changeset (https://www.openstreetmap.org/changeset/151182042) where about three thousand untagged nodes were created around Raffles Hills. In my evaluation of the area and features, I noticed that these nodes seem to correspond to the edge and vertices of buildings in Bing aerial imagery. Untagged nodes generally serve no purpose, but given this context, I am curious whether something was missing in that changeset. Let me know what you think.