Set caption font size in memoir

Question

How do I set the default caption font in a memoir?

I tried:

\documentclass{memoir}
\usepackage[font=small]{caption}

But that gives me a warning:

Class memoir Warning: You are using the caption package with the memoir (memoir) class. This may cause unexpected or inconsistent (memoir) results if you use any of memoir's captioning facilities.

Answer 1

As egreg mentioned in his comment, you should use memoir's commands \captionnamefont and \captiontitlefont:

\documentclass{memoir}

\captionnamefont{\small}
\captiontitlefont{\small}

\begin{document}
Test text

\begin{figure}[htbp]
\centering
A
\caption{A test caption}
\end{figure}

\end{document}