--- a
+++ b/R/data.R
@@ -0,0 +1,16 @@
+## how to document datasets: you need to specify @docType and @name; do not
+## forget NULL in the end
+
+#' Xena Hub Information
+#'
+#' This `data.frame` is very useful for selecting datasets fastly and
+#' independent on APIs of UCSC Xena Hubs.
+#'
+#' @docType data
+#' @name XenaData
+#' @format A `tibble`.
+#' @source Generated from UCSC Xena Data Hubs.
+#' @examples
+#' data(XenaData)
+#' str(XenaData)
+NULL