diff --git a/docs/src/docPages/guide/custom-extensions.md b/docs/src/docPages/guide/custom-extensions.md
index 6f67a98d..1e0bd623 100644
--- a/docs/src/docPages/guide/custom-extensions.md
+++ b/docs/src/docPages/guide/custom-extensions.md
@@ -404,7 +404,7 @@ const CustomExtension = Extension.create({
   onUpdate() {
     // The content has changed.
   },
-  onSelection() {
+  onSelectionUpdate({editor}) {
     // The selection has changed.
   },
   onTransaction({ transaction }) {