diff --git a/linear_system_class6.txt b/linear_system_class6.txt
index 6e2d5d3..87fe4ae 100644
--- a/linear_system_class6.txt
+++ b/linear_system_class6.txt
@@ -1,3 +1,6 @@
+Numerical matrices for the exercise sheet 6:
+Iterative methods to solve linear systems
+
 Matrix A:
     60	-8	-4	8	-5	-9	-9	-8	-8	4
     -1	-40	-5	5	-5	9	5	-4	4	1