diff --git a/readme.md b/readme.md
index 8a0e622..6ca40b8 100644
--- a/readme.md
+++ b/readme.md
@@ -71,7 +71,7 @@ Now, running `node example` yields:
 
 Add links to headings.
 
-#### `options.behaviour`
+#### `options.behavior`
 
 How to create links (`string`, default: `'prepend'`).
 Pass `'prepend'` to inject the link before the heading text, `'append'` for a
diff --git a/src/__tests__/index.js b/src/__tests__/index.js
index d27a55e..5c47c4c 100644
--- a/src/__tests__/index.js
+++ b/src/__tests__/index.js
@@ -7,11 +7,25 @@ import html from 'remark-html'
 import headings from '..'
 
 const base = file => read(join(__dirname, 'fixtures', file), 'utf-8')
+const behaviors = ['append', 'prepend', 'wrap']
 
 test('should autolink headings', t => {
-  const behaviours = ['append', 'prepend', 'wrap']
+  behaviors.forEach(b => {
+    t.is(
+      remark()
+        .use(slug)
+        .use(html)
+        .use(headings, {behavior: b})
+        .processSync(base('input.md'))
+        .toString(),
+      base(`output.${b}.html`),
+      `should ${b} headings`
+    )
+  })
+})
 
-  behaviours.forEach(b => {
+test('should autolink headings with deprecated option', t => {
+  behaviors.forEach(b => {
     t.is(
       remark()
         .use(slug)
diff --git a/src/index.js b/src/index.js
index bd8edc0..a89133d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,7 +1,7 @@
 import visit from 'unist-util-visit'
 import extend from 'extend'
 
-const behaviours = {prepend: 'unshift', append: 'push'}
+const behaviors = {prepend: 'unshift', append: 'push'}
 
 const contentDefaults = {
   type: 'element',
@@ -9,14 +9,27 @@ const contentDefaults = {
   properties: {className: ['icon', 'icon-link']}
 }
 
-const defaults = {behaviour: 'prepend', content: contentDefaults}
+const defaults = {behavior: 'prepend', content: contentDefaults}
+
+let deprecationWarningIssued = false
 
 export default function attacher(opts = {}) {
-  let {linkProperties, behaviour, content} = {...defaults, ...opts}
+  let {linkProperties, behavior, content} = {...defaults, ...opts}
   let method
   let hChildren
 
-  if (behaviour === 'wrap') {
+  // NOTE: Remove in next major version
+  if (opts.behaviour !== undefined) {
+    if (!deprecationWarningIssued) {
+      deprecationWarningIssued = true
+      console.warn(
+        'Deprecation Warning: `behaviour` is a nonstandard option. Use `behavior` instead.'
+      )
+    }
+    behavior = opts.behaviour
+  }
+
+  if (behavior === 'wrap') {
     method = wrap
   } else {
     method = inject
@@ -39,7 +52,7 @@ export default function attacher(opts = {}) {
   }
 
   function inject(node, url) {
-    node.children[behaviours[behaviour]]({
+    node.children[behaviors[behavior]]({
       type: 'link',
       url,
       title: null,