diff --git a/src/test-gradient-sample-nonsmooth.cc b/src/test-gradient-sample-nonsmooth.cc
index b21e3a79f67d68c3c8d79d1a735ef32af70a4e3f..f4d0c7c608be7756d124238e7d73a636c417bd18 100644
--- a/src/test-gradient-sample-nonsmooth.cc
+++ b/src/test-gradient-sample-nonsmooth.cc
@@ -47,7 +47,7 @@ int main() {
   */
   {
     start = b;
-    start /= (b.two_norm() + 1e-12);
+    start /= (b.two_norm() + 1e-12); // Make sure the norm is below 1;
     assert(start.two_norm() < 1);
 
     Functional::SmallVector numerical_descent;