diff --git a/src/lang/english_US.txt b/src/lang/english_US.txt
--- a/src/lang/english_US.txt
+++ b/src/lang/english_US.txt
@@ -236,7 +236,7 @@ STR_TOOLTIP_RESIZE                      
 STR_TOOLTIP_TOGGLE_LARGE_SMALL_WINDOW                           :{BLACK}Toggle large/small window size
 STR_TOOLTIP_VSCROLL_BAR_SCROLLS_LIST                            :{BLACK}Scroll bar - scrolls list up/down
 STR_TOOLTIP_HSCROLL_BAR_SCROLLS_LIST                            :{BLACK}Scroll bar - scrolls list left/right
-STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC                              :{BLACK}Demolish buildings etc. on a square of land
+STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC                              :{BLACK}Demolish buildings etc. on a square of land. Ctrl selects the area diagonally
 
 # Query window
 STR_BUTTON_DEFAULT                                              :{BLACK}Default
@@ -2069,9 +2069,9 @@ STR_STATION_BUILD_NOISE                 
 
 # Landscaping toolbar
 STR_LANDSCAPING_TOOLBAR                                         :{WHITE}Landscaping
-STR_LANDSCAPING_TOOLTIP_LOWER_A_CORNER_OF_LAND                  :{BLACK}Lower a corner of land
-STR_LANDSCAPING_TOOLTIP_RAISE_A_CORNER_OF_LAND                  :{BLACK}Raise a corner of land
-STR_LANDSCAPING_LEVEL_LAND_TOOLTIP                              :{BLACK}Level land
+STR_LANDSCAPING_TOOLTIP_LOWER_A_CORNER_OF_LAND                  :{BLACK}Lower a corner of land. Dragging lowers the first selected corner and levels the selected area to the new corner height. Ctrl selects the area diagonally
+STR_LANDSCAPING_TOOLTIP_RAISE_A_CORNER_OF_LAND                  :{BLACK}Raise a corner of land. Dragging raises the first selected corner and levels the selected area to the new corner height. Ctrl selects the area diagonally
+STR_LANDSCAPING_LEVEL_LAND_TOOLTIP                              :{BLACK}Level an area of land to the height of the first selected corner. Ctrl selects the area diagonally
 STR_LANDSCAPING_TOOLTIP_PURCHASE_LAND                           :{BLACK}Purchase land for future use
 
 # Object construction window