How do I make an alternate caption for a sidecaption using the Memoir class?

Question

I have a sidecaption in a Memoir class document that is very long. I need to create a short version of that caption for the list of figures. I have tried

\begin{sidecaption}[short caption]{long caption}

but that doesn't work, the "short caption" just disappears. How do I make a short caption when using Memoir's sidecaption environment?

Thanks

Answer 1

OK, I don't know what happened. But apparently the code that I used in my question:

\begin{sidecaption}[short caption]{long caption}

does work. I must not have compiled the code enough times. Possibly it takes 3 times - at least with my system. I had done it two times when I posted the question.