Be specific about the "Assembly." A good description helps others understand if they can use your file.
Version: Mention "Created in SolidWorks 2021" (as seen in your taskbar).
Content: Is it a sub-assembly, a final product, or a mechanism study?
Example: "A mechanical assembly of a [Insert Name, e.g., Universal Joint] designed in SolidWorks 2021. Features fully defined mates and realistic motion. Includes all individual part files."