Each time you create a document library, you’re given the option of writing a description to describe the type of content the library will include. It may be tempting to skip this part, but that’s not a good idea.
Instead, write a clear description so that other users can quickly understand what type of documents live in a particular document library. This is especially useful for when you add new users to your SharePoint team site.
To give you an example, let’s say you’re creating a SharePoint document library for your financial documents. In the description, rather than writing “financial docs,” instead write “This library contains all of the company’s financial records, including budgets, payroll, external costs, tax statements and reports.”