Q: how much memory can my iMac have?

I have a mid 2011 21.5 inch iMac with a 2.7 GHz i5, which was an option to order as an upgrade at the Apple online store, and cost and extra $300 or $400.

I have had it speced out by Crucial's MacScanner app, and the Crucial web page says I can put in up to 32 GB of memory.

Is this true? All the Apple specs I find say only 16 GB is the maximum, but I don't find my exact model's CPU specs, etc. in their listings.

my specs are:

Model Name:          iMac

  Model Identifier:          iMac12,1

  Processor Name:          Intel Core i5

  Processor Speed:          2.7 GHz

  Number of Processors:          1

  Total Number of Cores:          4

  L2 Cache (per Core):          256 KB

  L3 Cache:          6 MB

  Memory:          12 GB

  Boot ROM Version:          IM121.0047.B1F

  SMC Version (system):          1.71f22

  Serial Number (system):          D25HC0MLDHJT

  Hardware UUID:          03E448CE-B30B-54A7-A086-02A4BE2FDC1E

If this is capable of using 32 GB, I would be happy to go that route (who wouldn't?), but I don't want to purchase 8 GB modules and then find that they won't work.

Thanks for any info!