diff --git a/book/chapter-03-gbkb-reference.md b/book/chapter-03-gbkb-reference.md
index 2c9912b2..0c72e099 100644
--- a/book/chapter-03-gbkb-reference.md
+++ b/book/chapter-03-gbkb-reference.md
@@ -54,7 +54,7 @@ use dialog:*dialogName* instead of specifing an text answer.
 
 ## How To
 
-### Updating the Bot Knoledge Base (.gbkb folder)
+### Updating the Bot Knowledge Base (.gbkb folder)
 
 The subjects.json file contains all information related to the subject tree and can be used to build the menu carrousel as well give a set of words to be used as subject catcher in the conversation. A hierarchy can be specified.