add link to concept

Author: PatrickFarley

articles/ai-services/content-safety/quickstart-protected-material.md

@@ -13,7 +13,7 @@ ms.author: pafarley
 
 # Quickstart: Detect protected material (preview)
 
-Protected material text describes language that matches known text content (for example, song lyrics, articles, recipes, selected web content). This feature can be used to identify and block known text content from being displayed in language model output (English content only).
+Protected material text describes language that matches known text content (for example, song lyrics, articles, recipes, selected web content). This feature can be used to identify and block known text content from being displayed in language model output (English content only). For more information, see [Protected material concepts](./concepts/protected-material.md).
 
 ## Prerequisites