diff --git a/API.md b/API.md
index 22778b4ba..3426b4ba3 100644
--- a/API.md
+++ b/API.md
@@ -15,6 +15,7 @@
     -   [isVisible](#isvisible)
     -   [isNotVisible](#isnotvisible)
     -   [hasAttribute](#hasattribute)
+    -   [isDisabled](#isdisabled)
     -   [isNotDisabled](#isnotdisabled)
     -   [doesNotHaveAttribute](#doesnothaveattribute)
     -   [hasClass](#hasclass)
@@ -254,8 +255,27 @@ or regular expression.
 assert.dom('input.password-input').hasAttribute('type', 'password');
 ```
 
+### isDisabled
+
+-   **See: [#isNotDisabled](#isNotDisabled)**
+
+Assert that the [HTMLElement][] or an [HTMLElement][] matching the
+`selector` is disabled.
+
+**Parameters**
+
+-   `message` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** 
+
+**Examples**
+
+```javascript
+assert.dom('.foo').isDisabled();
+```
+
 ### isNotDisabled
 
+-   **See: [#isDisabled](#isDisabled)**
+
 Assert that the [HTMLElement][] or an [HTMLElement][] matching the
 `selector` is not disabled.
 
diff --git a/documentation.yml b/documentation.yml
index 678a928b2..e4f31d84f 100644
--- a/documentation.yml
+++ b/documentation.yml
@@ -29,6 +29,7 @@ toc:
       - isVisible
       - isNotVisible
       - hasAttribute
+      - isDisabled
       - isNotDisabled
       - doesNotHaveAttribute
       - hasClass
diff --git a/lib/assertions.js b/lib/assertions.js
index ac4574958..57506bf01 100644
--- a/lib/assertions.js
+++ b/lib/assertions.js
@@ -259,6 +259,18 @@ export default class DOMAssertions {
     }
   }
 
+  /**
+   *  Assert that the [HTMLElement][] or an [HTMLElement][] matching the
+   * `selector` is disabled.
+   *
+   * @name isDisabled
+   * @param {string?} message
+   *
+   * @example
+   * assert.dom('.foo').isDisabled();
+   *
+   * @see {@link #isNotDisabled}
+   */
   isDisabled(message) {
     let element = this.findTargetElement();
 
@@ -290,6 +302,7 @@ export default class DOMAssertions {
    * @example
    * assert.dom('.foo').isNotDisabled();
    *
+   * @see {@link #isDisabled}
    */
   isNotDisabled(message) {
     isNotDisabled.call(this, message);