Updating from iOS 6.1 to 6.1.3 via iTunes but update Size is almost 1GB
I'm updating from iOS 6.1 to 6.1.3 via iTunes but update Size is almost 1GB and where as on many websites this update is mentioned around 18MB. Can anyone elaborate?
P.S. Right now I'm using iOS 6.1 and didn't update my phone to previous 6.1.2 but now updating to 6.1.3, does previous update will also be included if now I update to 6.1.3?
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iPhone 5, iOS 6.1