diff --git a/Polyhedron/demo/Polyhedron/MainWindow.h b/Polyhedron/demo/Polyhedron/MainWindow.h
index f2178f77a14..db19fea7062 100644
--- a/Polyhedron/demo/Polyhedron/MainWindow.h
+++ b/Polyhedron/demo/Polyhedron/MainWindow.h
@@ -55,7 +55,7 @@ public slots:
   void updateViewerBBox();
   void open(QString);
 
-  /// given a file extension file, returns true if `filename` match the filter
+  /// given a file extension file, returns true if `filename` matches the filter
   bool file_matches_filter(const QString& filters, const QString& filename);
 
   /// Open a file with a given loader, and return true iff it was successful.