updated README.md with dependant field information

README.md

@@ -413,6 +413,7 @@ or [`input`](https://developer.mozilla.org/en-US/docs/Web/API/Element/input_even
 
 ## Field Options
 
+* [dependant](#dependant)
 * [maxCount](#maxcount)
 * [minCount](#mincount)
 * [optional](#optional)
@@ -435,6 +436,27 @@ properly formatted JSON object with the properties and values below.
 </div>
 ```
 
+### dependant
+
+**Default:** `null`
+
+Setting the `dependant` value of one field to another field's `name` attribute
+value will disable the field when its dependant does not contain a value.
+
+```html
+<figure class="form-group">
+    <label for="dependant-parent">Dependant Parent</label>
+    <input id="dependant-parent" type="text" name="dependant_parent">
+    <figcaption>This field dynamically enables/disables the 'Dependant Child' field if it has a value.</figcaption>
+</figure>
+
+<figure class="form-group">
+    <label for="dependant-child">Dependant Child</label>
+    <input data-validation='{"dependant": "dependant_parent"}' id="dependant-child" type="text" name="dependant_child">
+    <figcaption>This field dynamically enables/disables if the 'Dependant Parent' field has a value.</figcaption>
+</figure>
+```
+
 ### maxCount (Checkboxes Only)
 
 **Default:** `null`