diff --git a/docs/pages/docs/mutations.md b/docs/pages/docs/mutations.md
index 79c21da6..492664cd 100644
--- a/docs/pages/docs/mutations.md
+++ b/docs/pages/docs/mutations.md
@@ -18,7 +18,7 @@ class CreatePerson(graphene.Mutation):
     class Input:
         name = graphene.String()
 
-    ok = graphene.String()
+    ok = graphene.Boolean()
     person = graphene.Field('Person')
 
     @classmethod