diff --git a/CodeIntroduction.md b/CodeIntroduction.md
index e09291a5..9bbe64dd 100644
--- a/CodeIntroduction.md
+++ b/CodeIntroduction.md
@@ -125,7 +125,7 @@ Embeds can be introduced as Embedabble via the controller, not only Quill. This
   EditorTextSelectionOverlay - An object that manages a pair of text selection handles.
 - setState → Build → _Editor
 
-### NotifiesListers
+### notifyListeners
 - history change
 - replace text
 - format text