From 6cbc57235da3a996657dd139ba73242781ea9703 Mon Sep 17 00:00:00 2001
From: apidesigner <z@goodapi.co>
Date: Mon, 30 Jan 2017 10:34:25 +0000
Subject: [PATCH] Updates core-principles/openapi-specification.md

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 SUMMARY.md                               | 6 ++----
 core-principles/openapi-specification.md | 2 ++
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 create mode 100644 core-principles/openapi-specification.md

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 * [Introduction](README.md)
 * [Core Principles](core-principles/README.md)
-    * [API First](core-principles/api-first.md)
-
-
-
+  * [API First](core-principles/api-first.md)
+  * [OpenAPI Specification](core-principles/openapi-specification.md)
 
diff --git a/core-principles/openapi-specification.md b/core-principles/openapi-specification.md
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+# OpenAPI Specification
+Every API has to be described using the [OpenAPI Specification (formerly known as Swagger Specification) version 2.0](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md).