From 412104fa0a84dfd602a7fc591cdfdab5995956e5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Crozet?= <developer@crozet.re>
Date: Thu, 9 Dec 2021 13:31:39 +0100
Subject: [PATCH] Add comment about the origin of the failing 3x3 SVD matrix

---
 tests/linalg/svd.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/linalg/svd.rs b/tests/linalg/svd.rs
index 573b5c1b..c5b2d9c1 100644
--- a/tests/linalg/svd.rs
+++ b/tests/linalg/svd.rs
@@ -364,6 +364,9 @@ fn svd_fail() {
 #[test]
 #[rustfmt::skip]
 fn svd3_fail() {
+    // NOTE: this matrix fails the special case done for 3x3 SVDs.
+    // It was found on an actual application using SVD as part of the minimization of a
+    // quadratic error function.
     let m = nalgebra::matrix![
         0.0, 1.0, 0.0;
         0.0, 1.7320508075688772, 0.0;