openpyxl documentation

[OldMainframeProgrammer]

I started a project early last spring reading and updating an excel spreadsheet and got pulled off it for other activities. I'm now back to it. The little bit of sample code that I'd written imports from openpyxl and I'm looking for the documentation for openpyxl. When I got to python.org and search the documentation there for openpyxl it returns no results. My browser history doesn't go back that far.
Thanks,
Old Mainframe Programmer