diff --git a/docs/src/docPages/api/schema.md b/docs/src/docPages/api/schema.md
index e31abcdb..22d101a8 100644
--- a/docs/src/docPages/api/schema.md
+++ b/docs/src/docPages/api/schema.md
@@ -226,7 +226,7 @@ Mark.create({
   // add this mark to the 'basic' group
   group: 'basic',
   // add this mark to the 'basic' and the 'foobar' group
-  group: 'foobar',
+  group: 'basic foobar',
 })
 ```