diff --git a/src/components/Button.jsx b/src/components/Button.jsx
index 6e52c476..cbddd5a8 100644
--- a/src/components/Button.jsx
+++ b/src/components/Button.jsx
@@ -13,6 +13,7 @@ class Button extends React.Component {
     disabled: PropTypes.bool,
     type: PropTypes.string,
     id: PropTypes.string,
+    title: PropTypes.string,
   }
 
   render() {
diff --git a/src/components/layers/LayerListGroup.jsx b/src/components/layers/LayerListGroup.jsx
index 480f6fd0..9d62f075 100644
--- a/src/components/layers/LayerListGroup.jsx
+++ b/src/components/layers/LayerListGroup.jsx
@@ -7,7 +7,8 @@ export default class LayerListGroup extends React.Component {
     title: PropTypes.string.isRequired,
     "data-wd-key": PropTypes.string,
     isActive: PropTypes.bool.isRequired,
-    onActiveToggle: PropTypes.func.isRequired
+    onActiveToggle: PropTypes.func.isRequired,
+    'aria-controls': PropTypes.string,
   }
 
   render() {