Update README.md

cebe · web-flow · commit 059b1765f7f2 · 2019-06-26T08:46:25.000+02:00
diff --git a/README.md b/README.md
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 Yii Framework Application Template for quickly building API-first applications.
 
+Based on [yii2-openapi](https://github.com/cebe/yii2-openapi) (code generator) and [php-openapi](https://github.com/cebe/php-openapi) (specification reader and validator).
+
 ## Overview
 
 This application template consists of 3 application tiers:
