diff --git a/README.md b/README.md
index 7ccacaf..faaf4ff 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ var editor = EditorJS({
   
   tools: {
     ...
-    Marker: {
+    marker: {
       class: Marker,
       shortcut: 'CMD+SHIFT+M',
     }