+The optional `among` parameter limits display to pages that match a
+[[ikiwiki/PageSpec]]. For instance, to display a cloud of tags used on blog
+entries, you could use:
+
+ \[[!pagestats pages="tags/*" among="blog/posts/*"]]
+
+or to display a cloud of tags related to Linux, you could use:
+
+ \[[!pagestats pages="tags/* and not tags/linux" among="tagged(linux)"]]
+