diff --git a/src/app.cpp b/src/app.cpp
index b39d27df..fc66e1b1 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -6,9 +6,9 @@
 #include <QPixmapCache>
 #if QT_VERSION < QT_VERSION_CHECK(5, 4, 0)
 #include <QGLFormat>
-#else // QT 5
+#else // QT 5.4
 #include <QSurfaceFormat>
-#endif // QT 5
+#endif // QT 5.4
 #include "gui.h"
 #include "app.h"
 
@@ -31,11 +31,11 @@ App::App(int &argc, char **argv) : QApplication(argc, argv),
 	QGLFormat fmt;
 	fmt.setSamples(4);
 	QGLFormat::setDefaultFormat(fmt);
-#else
+#else // QT 5.4
 	QSurfaceFormat fmt;
 	fmt.setSamples(4);
 	QSurfaceFormat::setDefaultFormat(fmt);
-#endif
+#endif // QT 5.4
 
 	QPixmapCache::setCacheLimit(65536);
 
diff --git a/src/graphview.cpp b/src/graphview.cpp
index cdd71747..febb5eb0 100644
--- a/src/graphview.cpp
+++ b/src/graphview.cpp
@@ -5,9 +5,9 @@
 #include <QPaintDevice>
 #if QT_VERSION < QT_VERSION_CHECK(5, 4, 0)
 #include <QGLWidget>
-#else // QT 5
+#else // QT 5.4
 #include <QOpenGLWidget>
-#endif // QT 5
+#endif // QT 5.4
 #include <QSysInfo>
 #include "config.h"
 #include "axisitem.h"
@@ -468,9 +468,9 @@ void GraphView::useOpenGL(bool use)
 #endif // Q_OS_WIN32
 #if QT_VERSION < QT_VERSION_CHECK(5, 4, 0)
 		setViewport(new QGLWidget);
-#else // QT 5
+#else // QT 5.4
 		setViewport(new QOpenGLWidget);
-#endif // QT 5
+#endif // QT 5.4
 	} else
 		setViewport(new QWidget);
 }
diff --git a/src/pathview.cpp b/src/pathview.cpp
index d9b99a8b..5928bbb8 100644
--- a/src/pathview.cpp
+++ b/src/pathview.cpp
@@ -718,9 +718,9 @@ void PathView::useOpenGL(bool use)
 #endif // Q_OS_WIN32
 #if QT_VERSION < QT_VERSION_CHECK(5, 4, 0)
 		setViewport(new QGLWidget);
-#else // QT 5
+#else // QT 5.4
 		setViewport(new QOpenGLWidget);
-#endif // QT 5
+#endif // QT 5.4
 	} else
 		setViewport(new QWidget);
 }