diff --git a/lib/function/algebra/decomposition/lup.js b/lib/function/algebra/decomposition/lup.js
index 964f1375c..0e5f69b85 100644
--- a/lib/function/algebra/decomposition/lup.js
+++ b/lib/function/algebra/decomposition/lup.js
@@ -44,7 +44,7 @@ function factory (type, config, load, typed) {
    *
    * @param {Matrix | Array} A    A two dimensional matrix or array for which to get the LUP decomposition.
    *
-   * @return {Object}      The lower triangular matrix, the upper triangular matrix and the permutation matrix.
+   * @return {{L: Array | Matrix, U: Array | Matrix, P: Array.<number>}} The lower triangular matrix, the upper triangular matrix and the permutation matrix.
    */
   var lup = typed('lup', {