diff --git a/src/checkbox-svg-map.jsx b/src/checkbox-svg-map.jsx
index 9c2b4d7..4a973f7 100644
--- a/src/checkbox-svg-map.jsx
+++ b/src/checkbox-svg-map.jsx
@@ -22,6 +22,7 @@ class CheckboxSVGMap extends React.Component {
 		if (this.props.selectedLocationIds) {
 			// Cannot use ref on SvgMap (with React 16.0.0) because it is a functional component
 			// https://5a046bf5a6188f4b8fa4938a--reactjs.netlify.app/docs/refs-and-the-dom.html#refs-and-functional-components
+			// TODO: Find a way to test it
 			const svgNode = ReactDOM.findDOMNode(this);
 			const selectedLocations = this.props.selectedLocationIds.map(locationId => svgNode.getElementById(locationId));