diff --git a/halo_mass_functions.py b/halo_mass_functions.py
index 69605f8..7ca3557 100644
--- a/halo_mass_functions.py
+++ b/halo_mass_functions.py
@@ -57,6 +57,7 @@ def monofonic_tests():
             # break
         # break
     plt.legend()
+    fig.savefig(Path(f"~/tmp/halo_mass_function.pdf").expanduser())
     plt.show()