diff --git a/win/win32/mhmain.c b/win/win32/mhmain.c
index 5f5d2042d..e77b37a90 100644
--- a/win/win32/mhmain.c
+++ b/win/win32/mhmain.c
@@ -747,6 +747,10 @@ LRESULT onWMCommand(HWND hWnd, WPARAM wParam, LPARAM lParam)
 			display_file(LICENSE, TRUE);  
 			break;
 
+		case IDM_HELP_PORTHELP:
+			display_file(PORT_HELP, TRUE);  
+			break;
+
 		default:
 		   return 1;
 	}