how to make PHP completion for array indexes in phpstorm

In office announcement:
http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&ved=0CDgQFjAB&url=http%3A%2F%2Fblog.jetbrains.com%2Fphpstorm%2F2013%2F04%2Fphpstorm-6-0-1-released%2F&ei=RmQ2Upe-GKmwiQegyYBQ&usg=AFQjCNFfW4e4gtRcaXpK5cWwMaOv_l-K8w&sig2=ISB5a9yyNG9fwNGTdA7Ciw&bvm=bv.52164340,d.aGc

it says:
PHP completion for array indexes has been significantly improved

It's also meantioned:
"Code completion also supports array indexes in PHP code."
in http://www.jetbrains.com/phpstorm/features/

but how to make it happen?

That is, how to do array declaration in phpdoc comment?

For example, this doesn't work:
/** @var array([decision], [stake], [orig_stake]) $myvar */

(where [decision] etc. are array indexes)

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