However, adaptation reporting is not mandatory, as the Paris Agreement states that Parties “should”, as appropriate, submit and update an “adaptation communication” (Article 7.10). Decision 1/CP.21 states that this information “shall” be submitted biennially for all countries other than Least Developed Countries (LDCs) and Small Island Developing States (SIDS) (paragraph 90). Regular reporting on adaptation is already done under the UNFCCC, including via national communications (NCs).