diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -41,17 +41,17 @@ enum BuildVehicleWidgets {
 };
 
 static const Widget _build_vehicle_widgets[] = {
-	{   WWT_CLOSEBOX,   RESIZE_NONE,  COLOUR_GREY,     0,    10,     0,    13, STR_00C5,                STR_018B_CLOSE_WINDOW },
-	{    WWT_CAPTION,  RESIZE_RIGHT,  COLOUR_GREY,    11,   239,     0,    13, 0x0,                     STR_018C_WINDOW_TITLE_DRAG_THIS },
-	{ WWT_PUSHTXTBTN,   RESIZE_NONE,  COLOUR_GREY,     0,    80,    14,    25, STR_SORT_BY,             STR_SORT_ORDER_TIP},
-	{   WWT_DROPDOWN,  RESIZE_RIGHT,  COLOUR_GREY,    81,   239,    14,    25, 0x0,                     STR_SORT_CRITERIA_TIP},
-	{     WWT_MATRIX,     RESIZE_RB,  COLOUR_GREY,     0,   227,    26,    39, 0x101,                   STR_NULL },
-	{  WWT_SCROLLBAR,    RESIZE_LRB,  COLOUR_GREY,   228,   239,    26,    39, 0x0,                     STR_0190_SCROLL_BAR_SCROLLS_LIST },
-	{      WWT_PANEL,    RESIZE_RTB,  COLOUR_GREY,     0,   239,    40,   161, 0x0,                     STR_NULL },
+	{   WWT_CLOSEBOX,   RESIZE_NONE,  COLOUR_GREY,     0,    10,     0,    13, STR_00C5,     STR_018B_CLOSE_WINDOW },            // BUILD_VEHICLE_WIDGET_CLOSEBOX
+	{    WWT_CAPTION,  RESIZE_RIGHT,  COLOUR_GREY,    11,   239,     0,    13, 0x0,          STR_018C_WINDOW_TITLE_DRAG_THIS },  // BUILD_VEHICLE_WIDGET_CAPTION
+	{ WWT_PUSHTXTBTN,   RESIZE_NONE,  COLOUR_GREY,     0,    80,    14,    25, STR_SORT_BY,  STR_SORT_ORDER_TIP},                // BUILD_VEHICLE_WIDGET_SORT_ASSENDING_DESCENDING
+	{   WWT_DROPDOWN,  RESIZE_RIGHT,  COLOUR_GREY,    81,   239,    14,    25, 0x0,          STR_SORT_CRITERIA_TIP},             // BUILD_VEHICLE_WIDGET_SORT_DROPDOWN
+	{     WWT_MATRIX,     RESIZE_RB,  COLOUR_GREY,     0,   227,    26,    39, 0x101,        STR_NULL },                         // BUILD_VEHICLE_WIDGET_LIST
+	{  WWT_SCROLLBAR,    RESIZE_LRB,  COLOUR_GREY,   228,   239,    26,    39, 0x0,          STR_0190_SCROLL_BAR_SCROLLS_LIST }, // BUILD_VEHICLE_WIDGET_SCROLLBAR
+	{      WWT_PANEL,    RESIZE_RTB,  COLOUR_GREY,     0,   239,    40,   161, 0x0,          STR_NULL },                         // BUILD_VEHICLE_WIDGET_PANEL
 
-	{ WWT_PUSHTXTBTN,     RESIZE_TB,  COLOUR_GREY,     0,   114,   162,   173, 0x0,                     STR_NULL },
-	{ WWT_PUSHTXTBTN,    RESIZE_RTB,  COLOUR_GREY,   115,   227,   162,   173, 0x0,                     STR_NULL },
-	{  WWT_RESIZEBOX,   RESIZE_LRTB,  COLOUR_GREY,   228,   239,   162,   173, 0x0,                     STR_RESIZE_BUTTON },
+	{ WWT_PUSHTXTBTN,     RESIZE_TB,  COLOUR_GREY,     0,   114,   162,   173, 0x0,          STR_NULL },                         // BUILD_VEHICLE_WIDGET_BUILD
+	{ WWT_PUSHTXTBTN,    RESIZE_RTB,  COLOUR_GREY,   115,   227,   162,   173, 0x0,          STR_NULL },                         // BUILD_VEHICLE_WIDGET_RENAME
+	{  WWT_RESIZEBOX,   RESIZE_LRTB,  COLOUR_GREY,   228,   239,   162,   173, 0x0,          STR_RESIZE_BUTTON },                // BUILD_VEHICLE_WIDGET_RESIZE
 	{   WIDGETS_END},
 };