diff --git a/src/components/ItemTableFilter/ItemTableFilter.js b/src/components/ItemTableFilter/ItemTableFilter.js
index 2c61967..f17101b 100644
--- a/src/components/ItemTableFilter/ItemTableFilter.js
+++ b/src/components/ItemTableFilter/ItemTableFilter.js
@@ -35,7 +35,11 @@ export default function ItemTableFilter({ label, onChange }) {
 ItemTableFilter.propTypes = {
   /** The label that appears inside the search box. */
   "label": PropTypes.string,
-  /** The callback function that sets a column's filter value. */
+  /** The callback function that sets a column's filter value. <br />
+   * <b>Signature:</b> <code>function(event: object) => void</code> <br />
+   * <em>event</em>: The event source of the callback. 
+   * You can pull out the new value by accessing event.target.value (string).
+   */
   "onChange": PropTypes.func.isRequired
 };