diff --git a/SUMMARY.md b/SUMMARY.md
index 43e9eae..5b48e12 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -4,7 +4,7 @@
 * [Core Principles](core-principles/README.md)
   * [API First](core-principles/api-first.md)
   * [OpenAPI Specification](core-principles/openapi-specification.md)
-  * [Apiary](core-principles/apiary.md)
+  * [API design platform](core-principles/apiary.md)
   * [Version Control System](core-principles/version-control-system.md)
   * [Contract](core-principles/contract.md)
   * [Testing](core-principles/testing.md)
diff --git a/core-principles/apiary.md b/core-principles/apiary.md
index e3290a8..6b0430c 100644
--- a/core-principles/apiary.md
+++ b/core-principles/apiary.md
@@ -1,3 +1,9 @@
-# Apiary
-Every API description MUST be stored in [Apiary](https://apiary.io/) under the ADIDAS GROUP team. Apiary MUST be the **single source of truth** to learn about existing APIs within the organization. 
+# API design platform - Apiary
+1. [Apiary](https://apiary.io/) is the primary platform supporting [API first approach](./api-first.md). Apiary MUST be used during API Design.
+1. Every API description MUST be stored in [Apiary](https://apiary.io/) under the ADIDAS GROUP team. 
+1. Apiary MUST be the **single source of truth** to learn about existing APIs within the organization.
+ 
+> NOTE: API first approach is crucial when adopting the Microservice architecture.  
+ Describing what API is supposed to do also helps all stakeholders to align and better understand what will be delivered at the end.
+ It's not acceptable that API is developed first and later on described in some proprietary format.