Worst-case scenario: the UEd Goblin wipes the map and burns down your house.

From Unreal Wiki, The Unreal Engine Documentation Site

A "sticky" note. Level designers can place these in the level and then view them as a batch in the error/warnings window or as individual by reading the Text property.

This actor contains no code and performs no functions beyond that.

[edit] Properties

[edit] Main

string Text 

This property holds the text of the note from the Level Designer.

[edit] Discussion