+(defcustom gnus-cacheable-groups nil
+ "*Groups that match this regexp will be cached.
+
+If you only want to cache your nntp groups, you could set this
+variable to \"^nntp\".
+
+If a group matches both gnus-cacheable-groups and gnus-uncacheable-groups
+it's not cached."
+ :group 'gnus-cache
+ :type '(choice (const :tag "off" nil)
+ regexp))
+