diff --git a/Textbox.md b/Textbox.md
index c93e348..2ef0042 100644
--- a/Textbox.md
+++ b/Textbox.md
@@ -6,6 +6,8 @@ To read back what was typed, use the [[Text]]() array:
 
     Var$ = Text(ControlID)
 
+The Caption property can be used to display a caption inside the textbox. The caption is hidden as soon as the user starts typing.
+
 ###[[Events]]
 * [[Click|Mouse events#click]]
 * [[MouseDown/MouseUp|Mouse events#mousedownmouseup]]