diff --git a/can-calc-bit-timing.c b/can-calc-bit-timing.c
index 6d5b6d0..d99bd22 100644
--- a/can-calc-bit-timing.c
+++ b/can-calc-bit-timing.c
@@ -363,9 +363,9 @@ static struct calc_bittiming_const can_calc_consts[] = {
 		},
 		.ref_clk = {
 			/* The mcp251x uses half of the external OSC clock as the base clock */
-			{ .clk =  8000000 / 2, },
-			{ .clk = 16000000 / 2, },
-			{ .clk = 20000000 / 2, },
+			{ .clk =  8000000 / 2, .name = "8 MHz OSC" },
+			{ .clk = 16000000 / 2, .name = "16 MHz OSC" },
+			{ .clk = 20000000 / 2, .name = "20 MHz OSC" },
 		},
 		.printf_btr = printf_btr_mcp251x,
 	}, {