@@ -10,8 +10,10 @@

 ##' @param as.Date logical whether using Date class in time tree

 ##' @param yscale y scale

 ##' @param yscale_mapping yscale mapping for category variable

-##' @param ladderize logical

-##' @param right logical

+##' @param ladderize logical (default \code{TRUE}). Should the tree be re-organized to have a 'ladder'

+##' aspect?

+##' @param right logical. If \code{ladderize = TRUE}, should the ladder have the smallest clade on the

+##' right-hand side? See \code{\link[ape]{ladderize}} for more information. 

 ##' @param branch.length variable for scaling branch, if 'none' draw cladogram

 ##' @param ... additional parameter

 ##' @return tree

@@ -25,6 +27,7 @@

 ##' @importFrom ggplot2 coord_polar

 ##' @export

 ##' @author Yu Guangchuang

+##' @seealso \code{\link[ape]{ladderize}}

 ##' @examples

 ##' require(ape)

 ##' tr <- rtree(10)