diff --git a/R-package/R/xgboost.R b/R-package/R/xgboost.R
index 3d5ad1d89..3b01868f9 100644
--- a/R-package/R/xgboost.R
+++ b/R-package/R/xgboost.R
@@ -77,7 +77,7 @@
 #'      \item \code{ndcg} Normalized Discounted Cumulative Gain. \url{http://en.wikipedia.org/wiki/NDCG}
 #'   }
 #'   
-#' More parameters are available in the Wiki \url{https://github.com/tqchen/xgboost/wiki/Parameters}
+#' More parameters are available in the Wiki \url{https://github.com/tqchen/xgboost/wiki/Parameters}.
 #' 
 #' @examples
 #' data(agaricus.train, package='xgboost')