var rsc.io/qr.comment

2 uses

	rsc.io/qr (current package)
		png.go#L57: 	w.writeChunk("tEXt", comment)
		png.go#L69: var comment = []byte("Software\x00QR-PNG http://qr.swtch.com/")

The pages are generated with Golds v0.6.7. (GOOS=linux GOARCH=amd64)
Golds is a Go 101 project developed by Tapir Liu.
PR and bug reports are welcome and can be submitted to the issue list.
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