diff --git a/R-package/R/xgb.DMatrix.R b/R-package/R/xgb.DMatrix.R
index 6bd10a189..c5f4fed72 100644
--- a/R-package/R/xgb.DMatrix.R
+++ b/R-package/R/xgb.DMatrix.R
@@ -332,7 +332,7 @@ slice.xgb.DMatrix <- function(object, idxset, ...) {
 #' 
 #' @param x an xgb.DMatrix object
 #' @param verbose whether to print colnames (when present)
-#' 
+#' @param ... not currently used
 #' 
 #' @examples
 #' data(agaricus.train, package='xgboost')
@@ -340,7 +340,7 @@ slice.xgb.DMatrix <- function(object, idxset, ...) {
 #' dtrain <- xgb.DMatrix(train$data, label=train$label)
 #' 
 #' dtrain
-#' print(dtrain, verbose=T)
+#' print(dtrain, verbose=TRUE)
 #' @export
 print.xgb.DMatrix <- function(x, verbose=FALSE, ...) {
   cat('xgb.DMatrix  dim:', nrow(x), 'x', ncol(x), ' info: ')
diff --git a/R-package/man/print.xgb.DMatrix.Rd b/R-package/man/print.xgb.DMatrix.Rd
index c90e05c93..95837b9f4 100644
--- a/R-package/man/print.xgb.DMatrix.Rd
+++ b/R-package/man/print.xgb.DMatrix.Rd
@@ -10,6 +10,8 @@ print.xgb.DMatrix(x, verbose = FALSE, ...)
 \item{x}{an xgb.DMatrix object}
 
 \item{verbose}{whether to print colnames (when present)}
+
+\item{...}{not currently used}
 }
 \description{
 Print information about xgb.DMatrix. 
@@ -21,6 +23,6 @@ train <- agaricus.train
 dtrain <- xgb.DMatrix(train$data, label=train$label)
 
 dtrain
-print(dtrain, verbose=T)
+print(dtrain, verbose=TRUE)
 }