diff --git a/book/chapter-06-gbapp-reference.md b/book/chapter-06-gbapp-reference.md
index 5d9e9068..eb52f70f 100644
--- a/book/chapter-06-gbapp-reference.md
+++ b/book/chapter-06-gbapp-reference.md
@@ -136,6 +136,7 @@ static getDialogs(bot: BotAdapter, min: GBMinInstance) {
 ## Fork concept
 
 Is the implementation of new software based on existing software. The branch takes advantage of the data already used in other software to generate a new one.
+This in some way contributes to a better understanding of how it works.
 
 ## How To...