The link to the official RTF spec links an unsearchable PDF document. Archive has [another][oth] version which is searchable. Add it in readme [oth]: https://web.archive.org/web/20190708132914/http://www.kleinlercher.at/tools/Windows_Protocols/Word2007RTFSpec9.pdf
The link to the official RTF spec links an unsearchable PDF document. Archive has another version which is searchable. Add it in readme