documentationdoc·u·men·ta·tion /ˌdɒkjəmənˈteɪʃən, -men-ˌdɑːk-/ noun [uncountableU]1documents that are used to prove that something is true or correct, or as a record of somethingHe was asked to provide documentation of his personal finances.
2documents that explain how a piece of equipment worksThe lack of documentation has caused customers a significant amount of frustration.