When a document is created the version of the software it was created in is stamped to the specification file.

More information

In order to check which version of the software your specification was created in, simply open the specification and then select Edit > Document > Properties.

You will then be presented with the following screen, which also allows you to change the document title:



By clicking on the Details link, a dialog box will appear informing you of which version of the software your current specification was created in.