diff --git a/browser/components/MarkdownPreview.js b/browser/components/MarkdownPreview.js
index 25245fa3..6af8e386 100755
--- a/browser/components/MarkdownPreview.js
+++ b/browser/components/MarkdownPreview.js
@@ -574,6 +574,7 @@ MarkdownPreview.propTypes = {
   onDoubleClick: PropTypes.func,
   onMouseUp: PropTypes.func,
   onMouseDown: PropTypes.func,
+  onContextMenu: PropTypes.func,
   className: PropTypes.string,
   value: PropTypes.string,
   showCopyNotification: PropTypes.bool,