diff --git a/src/emu/netlist/solver/mat_cr.h b/src/emu/netlist/solver/mat_cr.h
index 4972bc21a29..b4836f4c893 100644
--- a/src/emu/netlist/solver/mat_cr.h
+++ b/src/emu/netlist/solver/mat_cr.h
@@ -92,7 +92,7 @@ struct mat_cr_t
 		 *
 		 * ==> LUx = r
 		 *
-		 * ==> Ux = L?????r = w
+		 * ==> Ux = L⁻¹r = w
 		 *
 		 * ==> r = Lw
 		 *
diff --git a/src/emu/netlist/tools/nl_convert.c b/src/emu/netlist/tools/nl_convert.c
index f1629308404..b25fc4711de 100644
--- a/src/emu/netlist/tools/nl_convert.c
+++ b/src/emu/netlist/tools/nl_convert.c
@@ -179,7 +179,7 @@ nl_convert_base_t::unit_t nl_convert_base_t::m_units[] = {
 		{"M",   "CAP_M(%g)", 1.0e-3 },
 		{"u",   "CAP_U(%g)", 1.0e-6 }, /* eagle */
 		{"U",   "CAP_U(%g)", 1.0e-6 },
-		{"??",   "CAP_U(%g)", 1.0e-6    },
+		{"μ",   "CAP_U(%g)", 1.0e-6    },
 		{"N",   "CAP_N(%g)", 1.0e-9 },
 		{"P",   "CAP_P(%g)", 1.0e-12},
 		{"F",   "%ge-15",    1.0e-15},