8.110 commenting on a fact

You can use a non-defining clause beginning with 'which' to say something about the whole situation described in a main clause, rather than about someone or something mentioned in it.

• Minute computers need only minute amounts of power, which means that they will run on small batteries.
• I never met Brando again, which was a pity.
• Prior to speaking she was a little tense, which was understandable.