diff --git a/src/lang/english.txt b/src/lang/english.txt
index 8b39d91b44..0d3fd279af 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -2139,7 +2139,7 @@ STR_OBJECT_CLASS_TRNS                                           :Transmitters
 
 # Tree planting window (last two for SE only)
 STR_PLANT_TREE_CAPTION                                          :{WHITE}Trees
-STR_PLANT_TREE_TOOLTIP                                          :{BLACK}Select tree type to plant
+STR_PLANT_TREE_TOOLTIP                                          :{BLACK}Select tree type to plant. If the tile already has a tree, this will add more trees of mixed types independent of the selected type
 STR_TREES_RANDOM_TYPE                                           :{BLACK}Trees of random type
 STR_TREES_RANDOM_TYPE_TOOLTIP                                   :{BLACK}Place trees of random type. Shift toggles building/showing cost estimate
 STR_TREES_RANDOM_TREES_BUTTON                                   :{BLACK}Random Trees