diff --git a/src/MixerBoard.h b/src/MixerBoard.h
index 505092c68..0e1c98a67 100644
--- a/src/MixerBoard.h
+++ b/src/MixerBoard.h
@@ -17,7 +17,7 @@
 #include <wx/frame.h> // to inherit
 #include <wx/scrolwin.h> // to inherit
 
-#include "widgets/ASlider.h"
+#include "widgets/ASlider.h" // to inherit
 #include "widgets/wxPanelWrapper.h"
 #include "commands/CommandManagerWindowClasses.h"
 
diff --git a/src/widgets/LinkingHtmlWindow.h b/src/widgets/LinkingHtmlWindow.h
index 30c1aa3ed..ec5002e1d 100644
--- a/src/widgets/LinkingHtmlWindow.h
+++ b/src/widgets/LinkingHtmlWindow.h
@@ -16,7 +16,7 @@
 #ifndef __AUDACITY_LINKINGHTMLWINDOW__
 #define __AUDACITY_LINKINGHTMLWINDOW__
 
-#include "HtmlWindow.h"
+#include "HtmlWindow.h" // to inherit
 #include "wxPanelWrapper.h"
 
 void OpenInDefaultBrowser(const wxHtmlLinkInfo& link);
diff --git a/src/widgets/OverlayPanel.h b/src/widgets/OverlayPanel.h
index a9196937d..93d4cae9d 100644
--- a/src/widgets/OverlayPanel.h
+++ b/src/widgets/OverlayPanel.h
@@ -11,7 +11,7 @@
 
 #include <memory>
 #include <vector>
-#include "BackedPanel.h"
+#include "BackedPanel.h" // to inherit
 
 class Overlay;