diff --git a/fenicsR13/solver.py b/fenicsR13/solver.py
index 536cf581f660285b758c8914e6d91554330fa9e7..fdeb9c4c7cd218db4eed78ab09ca568d6e5bc6ea 100644
--- a/fenicsR13/solver.py
+++ b/fenicsR13/solver.py
@@ -1393,6 +1393,8 @@ class Solver:
         >>> solver.form_rhs = L
         >>> solver.output_folder = "./"
         >>> solver._Solver__write_discrete_system()
+        Write ./A_0.mat
+        Write ./b_0.mat
         >>> print(open("A_0.mat","r").read())
         2.0000...00000e+00 -2.0000...00000e+00 0.000...000000e+00
         -2.0000...00000e+00 4.0000...00000e+00 -2.0000...00000e+00