diff --git a/docs/api/options.md b/docs/api/options.md
index c2f31793b..3fa3b0548 100644
--- a/docs/api/options.md
+++ b/docs/api/options.md
@@ -317,13 +317,13 @@ const Component = {
 let wrapper = mount(Component, {
   attachTo: '#root'
 })
-expect(wrapper.vm.$el.parentNode).to.not.be.null
+expect(wrapper.vm.$el.parentNode).not.toBeNull()
 wrapper.destroy()
 
 wrapper = mount(Component, {
   attachTo: document.getElementById('root')
 })
-expect(wrapper.vm.$el.parentNode).to.not.be.null
+expect(wrapper.vm.$el.parentNode).not.toBeNull()
 wrapper.destroy()
 ```