diff --git a/dune/istl/test/bcrsbuild.cc b/dune/istl/test/bcrsbuild.cc
index e388d32772e1d297bde8b4b418d72cffe36a8cc2..4c2e360a03af12efac815eb2a6e94dedf1a1111f 100644
--- a/dune/istl/test/bcrsbuild.cc
+++ b/dune/istl/test/bcrsbuild.cc
@@ -79,6 +79,7 @@ struct Builder<Dune::BCRSMatrix<B,A> >
   }
 };
 
+// This code used to trigger a valgrind 'uninitialized memory' warning; see FS 1041
 void testDoubleSetSize()
 {
   Dune::BCRSMatrix<Dune::FieldMatrix<double,1,1> > foo;