diff --git a/R/learn_gd.R b/R/learn_gd.R
index a4d6db4..be2e07f 100644
--- a/R/learn_gd.R
+++ b/R/learn_gd.R
@@ -90,6 +90,8 @@ learn_gd <- function(X, y, alpha, hiddenSize) {
 #' @importFrom stats runif
 #' @export
 #' @references \url{http://qua.st/handcoding-gradient-descent/}
+#' \url{http://iamtrask.github.io/2015/07/27/python-network-part2/}
+#' @seealso \code{\link{learn_gd}}
 #' @examples
 #' # create new data
 #' alpha = 0.5
diff --git a/man/learn_gd13.Rd b/man/learn_gd13.Rd
index 0d473dc..85cac30 100644
--- a/man/learn_gd13.Rd
+++ b/man/learn_gd13.Rd
@@ -30,5 +30,9 @@ learn_gd13(X, y, alpha, hidden_dim)
 }
 \references{
 \url{http://qua.st/handcoding-gradient-descent/}
+\url{http://iamtrask.github.io/2015/07/27/python-network-part2/}
+}
+\seealso{
+\code{\link{learn_gd}}
 }