Provide a little background on what SRFI-64 is.

Newcomers to Scheme may not be aware what SRFI-64 is.

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 [![Laminar](https://ci.systemreboot.net/badge/run64.svg)](https://ci.systemreboot.net/jobs/run64) [![Laminar](https://ci.systemreboot.net/badge/run64-website.svg)](https://ci.systemreboot.net/jobs/run64-website)
 
-run64 is a [SRFI-64](https://srfi.schemers.org/srfi-64/srfi-64.html) runner. It generates pretty, readable, colorful output featuring clear diffs between expected and actual values. run64 is meant to work with a SRFI-64 implementation, and is not a SRFI-64 implementation in itself.
+run64 is a [SRFI-64](https://srfi.schemers.org/srfi-64/srfi-64.html) runner. It generates pretty, readable, colorful output featuring clear diffs between expected and actual values.
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+SRFI-64 is a Scheme API for writing test suites. Your Scheme implementation likely comes with an implementation of SRFI-64. run64 plugs into such a SRFI-64 implementation, and produces prettier output. run64 is not a SRFI-64 implementation in itself.
 
 # Motivation