Update 3 1 ui components

3-1-ui-components.md

@@ -31,7 +31,7 @@ When you first start Mirae WAVE, this environment consists of the following elem
 
 By default, it displays and activates *Background Map* and *Borderlines Map* layers. 
 
-##### 6.  The **Actions Pane** displays the history of actions.
+##### 6.  The **Actions Pane** displays the history of actions related to the selected layer.
  You can undo and redo actions with *Undo* and *Redo* buttons, respectively.