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--- a/doc/index.md
+++ b/doc/index.md
@@ -16,9 +16,11 @@ This Release also includes a Robot Test Suite for all those services and a Postm
 
 ## What is OpenCAPIF?
 
+OpenCAPIF is an open source implementation of the CAPIF Core Function APIs plus the logic and additional services required to fulfill the 3GPP requirements and deliver the expected functionality.
+
 CAPIF is the “Common API Framework” defined by 3GPP to manage the APIs exposed by 3GPP networks in their northbound interfaces.
 
-CAPIF defines three types of entities:
+3GPP specifications for CAPIF defines three types of entities:
 
 * API Providers, which are the entities exposing APIs (e.g., NEF)
 * API Invokers, which are the entities that consume APIs (e.g., Applications), and