Explain cache pool origin

sstok · Oct 14, 2016 · 4ea6a3a · 4ea6a3a
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diff --git a/README.md b/README.md
@@ -63,6 +63,8 @@ From `$client` object, you can access to all GitHub.
 
 ## Cache usage
 
+This example uses the PSR6 cache pool [redis-adapter](https://github.com/php-cache/redis-adapter). See http://www.php-cache.com/ for alternatives.
+
 ```php
 <?php