diff --git a/R-package/R/getinfo.xgb.DMatrix.R b/R-package/R/getinfo.xgb.DMatrix.R
index 5b438049c..3a79fd2fb 100644
--- a/R-package/R/getinfo.xgb.DMatrix.R
+++ b/R-package/R/getinfo.xgb.DMatrix.R
@@ -4,20 +4,23 @@ setClass('xgb.DMatrix')
 #' 
 #' Get information of an xgb.DMatrix object
 #' 
-#' @param object Object of class "xgb.DMatrix"
-#' @param name the name of the field to get
-#' 
 #' @examples
 #' data(iris)
 #' iris[,5] <- as.numeric(iris[,5])
 #' dtrain <- xgb.DMatrix(as.matrix(iris[,1:4]), label=iris[,5])
 #' labels <- getinfo(dtrain, "label")
+#' @rdname getinfo
 #' @export
 #' 
 getinfo <- function(object, ...){
     UseMethod("getinfo")
 }
 
+#' @param object Object of class "xgb.DMatrix"
+#' @param name the name of the field to get
+#' @param ... other parameters
+#' @rdname getinfo
+#' @method getinfo xgb.DMatrix
 setMethod("getinfo", signature = "xgb.DMatrix", 
           definition = function(object, name) {
               if (typeof(name) != "character") {
diff --git a/R-package/R/slice.xgb.DMatrix.R b/R-package/R/slice.xgb.DMatrix.R
index 0c56829fa..8a93efc4d 100644
--- a/R-package/R/slice.xgb.DMatrix.R
+++ b/R-package/R/slice.xgb.DMatrix.R
@@ -6,22 +6,25 @@ setClass('xgb.DMatrix')
 #' Get a new DMatrix containing the specified rows of
 #' orginal xgb.DMatrix object
 #' 
-#' @param object Object of class "xgb.DMatrix"
-#' @param idxset a integer vector of indices of rows needed
-#' 
 #' @examples
 #' data(iris)
 #' iris[,5] <- as.numeric(iris[,5])
 #' dtrain <- xgb.DMatrix(as.matrix(iris[,1:4]), label=iris[,5])
 #' dsub <- slice(dtrain, 1:3)
+#' @rdname slice
 #' @export
 #' 
 slice <- function(object, ...){
     UseMethod("slice")
 }
 
+#' @param object Object of class "xgb.DMatrix"
+#' @param idxset a integer vector of indices of rows needed
+#' @param ... other parameters
+#' @rdname slice
+#' @method slice xgb.DMatrix
 setMethod("slice", signature = "xgb.DMatrix", 
-          definition = function(object, idxset) {
+          definition = function(object, idxset, ...) {
               if (class(object) != "xgb.DMatrix") {
                   stop("slice: first argument dtrain must be xgb.DMatrix")
               }
diff --git a/R-package/R/xgb.DMatrix.save.R b/R-package/R/xgb.DMatrix.save.R
index b108c2dad..4fcb71301 100644
--- a/R-package/R/xgb.DMatrix.save.R
+++ b/R-package/R/xgb.DMatrix.save.R
@@ -2,7 +2,7 @@
 #' 
 #' Save xgb.DMatrix object to binary file
 #' 
-#' @param model the model object.
+#' @param DMatrix the model object.
 #' @param fname the name of the binary file.
 #' 
 #' @examples
diff --git a/R-package/man/getinfo.Rd b/R-package/man/getinfo.Rd
index 4f63b5e92..05a25c152 100644
--- a/R-package/man/getinfo.Rd
+++ b/R-package/man/getinfo.Rd
@@ -1,14 +1,20 @@
 % Generated by roxygen2 (4.0.1): do not edit by hand
+\docType{methods}
 \name{getinfo}
 \alias{getinfo}
+\alias{getinfo,xgb.DMatrix-method}
 \title{Get information of an xgb.DMatrix object}
 \usage{
 getinfo(object, ...)
+
+\S4method{getinfo}{xgb.DMatrix}(object, name)
 }
 \arguments{
 \item{object}{Object of class "xgb.DMatrix"}
 
 \item{name}{the name of the field to get}
+
+\item{...}{other parameters}
 }
 \description{
 Get information of an xgb.DMatrix object
diff --git a/R-package/man/slice.Rd b/R-package/man/slice.Rd
index 06d79f6c4..7acb14a32 100644
--- a/R-package/man/slice.Rd
+++ b/R-package/man/slice.Rd
@@ -1,15 +1,21 @@
 % Generated by roxygen2 (4.0.1): do not edit by hand
+\docType{methods}
 \name{slice}
 \alias{slice}
+\alias{slice,xgb.DMatrix-method}
 \title{Get a new DMatrix containing the specified rows of
 orginal xgb.DMatrix object}
 \usage{
 slice(object, ...)
+
+\S4method{slice}{xgb.DMatrix}(object, idxset, ...)
 }
 \arguments{
 \item{object}{Object of class "xgb.DMatrix"}
 
 \item{idxset}{a integer vector of indices of rows needed}
+
+\item{...}{other parameters}
 }
 \description{
 Get a new DMatrix containing the specified rows of
diff --git a/R-package/man/xgb.DMatrix.save.Rd b/R-package/man/xgb.DMatrix.save.Rd
index d4932fa42..e5e70501d 100644
--- a/R-package/man/xgb.DMatrix.save.Rd
+++ b/R-package/man/xgb.DMatrix.save.Rd
@@ -6,7 +6,7 @@
 xgb.DMatrix.save(DMatrix, fname)
 }
 \arguments{
-\item{model}{the model object.}
+\item{DMatrix}{the model object.}
 
 \item{fname}{the name of the binary file.}
 }