NSLocalizedString with empty comment?

i found this good example to use NSLocalizedString : What is th开发者_如何学Goe second parameter of NSLocalizedString()?

NSLocalizedString(@"Save",@"Title of the Save button in the theme saving dialog");

.

/* Title of the Save button in the theme saving dialog */
"Save" = "Save";

But what if the comment in NSLocalizedString is empty ?what does is mean? Will it automatically know where to find the translated word in localize.strings?

Thanks

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The comment is reserved for the genstrings tool to help someone, who may or may not be technical, translate your localized strings into new languages.

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The first parameter is the key into localizable.strings. The second parameter is a comment meant to assist in translation. It won't effect the behavior of the application at all, so it doesn't strictly matter if it's empty or nil.