Why comments do not work after ; semicolon

Hi,
In version 5 of PL/SQL developer..From the command window,if we run the script
ALTER TABLE table_name
ADD column_name column-definition;--some comments here
This will result in an error saying invalid characters are not allowed i.e comments
But in version 7 of PL/SQL developer,this is allowed.
Can anyone explain me why this error come and why it is there in the first place?

This is about SQL*Plus. But it is worth to follow the same guidelines also for other tools in order to make your scripts more or less usabl by every tool.
Read http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14357/ch5.htm#sthref985
chapter Notes on Placing Comments
Gints Plivna
http://www.gplivna.eu

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Why comments do not work after ; semicolon

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