Adding gallery storage space

Please could someone clarify for me what this means

While adding extra storage, you will have a one-month validity. You can add extra time after.

this is what it says in the 'storage' section of the Miscellaneous

I want to buy 100mb extra gallery storage with 100 credits, but does this mean the 100 credits only buys me the space for one month?

I want to know about this to which is the reason why I'm bumping this. I really don't want to dump tons of credits just for photohosting.

Being new to my forum, I also would like to understand this better. I purchased 500 MB of storage but does it expire a month from today?

Not really knowable of the Gallery but if I can read the message that means to me that you will only have it for a month then you can add extra time after that.