add qr-backup

diff --git a/software.md b/software.md
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 | beta  | [ok-mixnet](https://github.com/za3k/ok-mixnet) | 2021-05-20 | a one-time-pad based, high-latency mixnet. proof of concept.
 | works | [passgen](https://github.com/za3k/short-programs#passgen) | 2016-01-16 | generates random passwords and passphrases
 | works | [prng](https://github.com/za3k/short-programs#prng) | 2019-01-04 | generate pseudo-random data. has a large number of features built-in to do things like test usb drives and cloud storage. good for testing chinese sd cards and usb sticks to make sure they're the claimed size.
+| works | [qr-backup](https://github.com/za3k/qr-backup/) | 2021-06-01 | generate paper backups of a file. the file can be restored by holding the paper up to a webcam.
 | works | [rip-chrome-history](https://github.com/za3k/rip-chrome-history) | 2017-06-06 | export chrome history, one per line.
 | works | [short-programs](https://github.com/za3k/short-programs) | 2021-05-04 | a variety of short programs. many are useful--some of them are listed separately here.
 | works | [transcribe](https://github.com/za3k/transcribe) | 2020-11-17 | a quick-and-dirty interface for transcribing scanned documents.