From f940239fd23915d14efaf313bffa09a69824cb9e Mon Sep 17 00:00:00 2001
From: Gilles <erans@apache.org>
Date: Tue, 18 Jul 2017 13:10:50 +0200
Subject: [PATCH] Javadoc.

---
 .../java/org/apache/commons/math4/linear/QRDecomposition.java  | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/org/apache/commons/math4/linear/QRDecomposition.java b/src/main/java/org/apache/commons/math4/linear/QRDecomposition.java
index aca40982a..27569b492 100644
--- a/src/main/java/org/apache/commons/math4/linear/QRDecomposition.java
+++ b/src/main/java/org/apache/commons/math4/linear/QRDecomposition.java
@@ -86,6 +86,9 @@ public class QRDecomposition {
      *
      * @param matrix The matrix to decompose.
      * @param threshold Singularity threshold.
+     * The matrix will be considered singular if the absolute value of
+     * any of the diagonal elements of the "R" matrix is smaller than
+     * the threshold.
      */
     public QRDecomposition(RealMatrix matrix,
                            double threshold) {