Update 3 4 control perspective

3-4-control-perspective.md

@@ -84,7 +84,7 @@ You can right-click the *Legend* or the *Limit Range* to speed up the setting op
 ![](img/3-4-right-click.png)
 
 > To Trang  
-> How about "### Controlling camera", and just giving it four sentences for each of "Zoom :", "Rotate : ", "Pan : ", "Zoom fit : "?  Actually "Zoom fit" cancel all the changes in zoom/rotate/pan and returns to the default camera position.
+> How about "### Controlling camera", and just giving it four sentences for each of "Zoom :", "Rotate : ", "Pan : ", "Zoom fit : "?  Actually "Zoom fit" cancel all the changes in zoom/rotate/pan and returns to the default camera position, which was decided at start-up based on user's timezone setting.
 
 
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