Since the Defold License is based on Apache 2.0 License we have after some review decided to add such a NOTICE file. This is what basically every Apache 2.0 licensed project does and it aligns with the text in the actual Apache 2.0 license, section 4d (or 4e in the case of the Defold license):
If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
include a readable copy of the attribution notices contained
within such NOTICE file
Sorry about that!
According to the Apache 2.0 and Defold License you actually need to include a full copy of the license (and a copyright notice). This was not accurately reflected in the COMPLYING WITH LICENSES text. We have updated this document to include this requirement.