diff --git a/DESCRIPTION b/DESCRIPTION
index 66a77bc..13cb2e5 100755
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -19,3 +19,6 @@ Maintainer: Venkatraman E. Seshan <seshanv@mskcc.org>
 License: GPL (>= 2)
 NeedsCompilation: yes
 VignetteBuilder: knitr
+Roxygen: list(markdown = TRUE)
+RoxygenNote: 7.2.3
+Encoding: UTF-8
diff --git a/R/ph2simon.R b/R/ph2simon.R
index 82dba4e..8884a0b 100755
--- a/R/ph2simon.R
+++ b/R/ph2simon.R
@@ -1,3 +1,36 @@
+#' Simon's 2-stage Phase II design
+#' 
+#' Calculates Optimal and Minimax 2-stage Phase II designs given by Richard
+#' Simon
+#' 
+#' @param pu unacceptable response rate
+#' @param pa response rate that is desirable
+#' @param ep1 threshold for the probability of declaring drug desirable under
+#' p0
+#' @param ep2 threshold for the probability of rejecting the drug under p1
+#' @param nmax maximum total sample size (default 100; can be at most 500)
+#' @return `ph2simon()` returns a list with pu, pa, alpha, beta and nmax as above
+#' and: \item{out}{matrix of best 2 stage designs for each value of total
+#' sample size n.  the 6 columns are: r1, n1, r, n, EN(p0), PET(p0)}
+#' 
+#' Trial is stopped early if <= r1 responses are seen in the first stage and
+#' treatment is considered desirable only when >r responses seen.
+#' 
+#' 
+#' @seealso [twostage.inference] [oc.twostage.bdry]
+#' @family ph2simon
+#' @references Simon R. (1989).  Optimal Two-Stage Designs for Phase II
+#' Clinical Trials. \emph{Controlled Clinical Trials} 10, 1-10.
+#' 
+#' Jung SH, Carey M and Kim KM. (2001). Graphical Search for Two-Stage Designs
+#' for Phase II Clinical Trials. \emph{Controlled Clinical Trials} 22, 367-372.
+#' @keywords design design
+#' @examples
+#' 
+#' ph2simon(0.2, 0.4, 0.1, 0.1)
+#' ph2simon(0.2, 0.35, 0.05, 0.05)
+#' ph2simon(0.2, 0.35, 0.05, 0.05, nmax=150)
+#' 
 ph2simon <- function(pu, pa, ep1, ep2, nmax = 100) {
   if(nmax > 1000) stop("nmax cannot exceed 1000")
   nmax1 <- nmax + 1
@@ -46,6 +79,8 @@ ph2simon <- function(pu, pa, ep1, ep2, nmax = 100) {
   ph2
 }
 
+#' @rdname ph2simon
+#' @export
 print.ph2simon <- function(x, ...) {
   xout <- x$out
   nmax <- x$nmax
@@ -62,6 +97,21 @@ print.ph2simon <- function(x, ...) {
   if(xopt[1,4]>nmax-10) warning(paste("  Optimal sample size too close to nmax. \n  Try increasing nmax (current value = ",nmax,")\n",sep=""))
 }
 
+#' Plots `ph2simon` object
+#'
+#' @param x object returned by ph2simon
+#' @param ... arguments to be passed onto plot and print commands called within 
+#'
+#' @return `plot.ph2simon()` returns a plot with the expected sample size against the maximum sample size as in
+#' Jung et al., 2001
+#' @family ph2simon
+#' @rdname ph2simon
+#' @export
+#'
+#' @examples
+#' ex <- ph2simon(0.2, 0.4, 0.1, 0.1)
+#' plot(ex)
+#' 
 plot.ph2simon <- function(x, ...) {
   xout <- x$out
   n <- nrow(xout)
diff --git a/man/ph2simon.Rd b/man/ph2simon.Rd
old mode 100755
new mode 100644
index a7c02ce..6d89a5f
--- a/man/ph2simon.Rd
+++ b/man/ph2simon.Rd
@@ -1,62 +1,67 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/ph2simon.R
 \name{ph2simon}
-\title{Simon's 2-stage Phase II design}
 \alias{ph2simon}
 \alias{print.ph2simon}
 \alias{plot.ph2simon}
-\keyword{design}
-\description{
-  Calculates Optimal and Minimax 2-stage Phase II designs given by
-  Richard Simon
-}
+\title{Simon's 2-stage Phase II design}
 \usage{
-ph2simon(pu, pa, ep1, ep2, nmax=100)
-\method{print}{ph2simon}(x, \dots)
-\method{plot}{ph2simon}(x, \dots)
+ph2simon(pu, pa, ep1, ep2, nmax = 100)
+
+\method{print}{ph2simon}(x, ...)
+
+\method{plot}{ph2simon}(x, ...)
 }
 \arguments{
-  \item{pu}{unacceptable response rate}
-  \item{pa}{response rate that is desirable}
-  \item{ep1}{threshold for the probability of declaring drug desirable
-    under p0}
-  \item{ep2}{threshold for the probability of rejecting the drug under
-    p1}
-  \item{nmax}{maximum total sample size (default 100; can be at most
-    500)}
-  \item{x}{object returned by ph2simon}
-  \item{...}{arguments to be passed onto plot and print commands called
-    within}
+\item{pu}{unacceptable response rate}
+
+\item{pa}{response rate that is desirable}
+
+\item{ep1}{threshold for the probability of declaring drug desirable under
+p0}
+
+\item{ep2}{threshold for the probability of rejecting the drug under p1}
+
+\item{nmax}{maximum total sample size (default 100; can be at most 500)}
+
+\item{x}{object returned by ph2simon}
+
+\item{...}{arguments to be passed onto plot and print commands called within}
 }
 \value{
-  ph2simon returns a list with pu, pa, alpha, beta and nmax as above
-  and:
-  \item{out}{matrix of best 2 stage designs for each value of total
-    sample size n.  the 6 columns are: r1, n1, r, n, EN(p0), PET(p0)}
+ph2simon returns a list with pu, pa, alpha, beta and nmax as above
+and: \item{out}{matrix of best 2 stage designs for each value of total
+sample size n.  the 6 columns are: r1, n1, r, n, EN(p0), PET(p0)}
 
-  Trial is stopped early if <= r1 responses are seen in the first stage
-  and treatment is considered desirable only when >r responses seen.
+Trial is stopped early if <= r1 responses are seen in the first stage and
+treatment is considered desirable only when >r responses seen.
 
-  The "print" method formats and returns the minimax and optimal
-  designs.  The "plot" plots the expected sample size agains the maximum
-  sample size as in Jung et al., 2001
+Plots the expected sample size against the maximum sample size as in
+Jung et al., 2001
 }
-
-\seealso{
-  \code{\link{twostage.inference}}, \code{\link{oc.twostage.bdry}}
+\description{
+Calculates Optimal and Minimax 2-stage Phase II designs given by Richard
+Simon
 }
-
 \examples{
-  ph2simon(0.2, 0.4, 0.1, 0.1)
-  ph2simon(0.2, 0.35, 0.05, 0.05)
-  ph2simon(0.2, 0.35, 0.05, 0.05, nmax=150)
-}
 
-\references{
-  Simon R. (1989).  Optimal Two-Stage Designs for Phase II Clinical
-  Trials. \emph{Controlled Clinical Trials} 10, 1-10.
+ph2simon(0.2, 0.4, 0.1, 0.1)
+ph2simon(0.2, 0.35, 0.05, 0.05)
+ph2simon(0.2, 0.35, 0.05, 0.05, nmax=150)
+
+ex <- ph2simon(0.2, 0.4, 0.1, 0.1)
+plot(ex)
 
-  Jung SH, Carey M and Kim KM. (2001). Graphical Search for Two-Stage
-  Designs for Phase II Clinical Trials. \emph{Controlled Clinical
-    Trials}  22, 367-372.
 }
+\references{
+Simon R. (1989).  Optimal Two-Stage Designs for Phase II
+Clinical Trials. \emph{Controlled Clinical Trials} 10, 1-10.
 
+Jung SH, Carey M and Kim KM. (2001). Graphical Search for Two-Stage Designs
+for Phase II Clinical Trials. \emph{Controlled Clinical Trials} 22, 367-372.
+}
+\seealso{
+\link{twostage.inference} \link{oc.twostage.bdry}
+}
+\concept{ph2simon}
 \keyword{design}