diff --git a/doc/sseg_codes.txt b/doc/sseg_codes.txt
index a985121..2cb2a26 100644
--- a/doc/sseg_codes.txt
+++ b/doc/sseg_codes.txt
@@ -4,11 +4,12 @@ Z: 11011010   0011 1101    0x3C
 A: 11101110   0111 0111    0x77
 M: 11101100   0111 0110    0x76
 O: 11111100   0111 1110    0x7E
-F: 10001110   0001 0111    0x47
+F: 10001110   0001 0111    0x17
 #: 01101100   0110 0110    0x66      note: two vertical lines only
 |: 00001100   0000 0110    0x06
 d: 01111010   0110 1101    0x6D
 H: 01101110   0110 0111    0x67
+N: 00101010   0100 0101    0x45
 
 0: 11111100   0111 1110    0x7E
 1: 01100000   0110 0000    0x60
diff --git a/src/sseg.c b/src/sseg.c
index 7a3dbc8..837de28 100644
--- a/src/sseg.c
+++ b/src/sseg.c
@@ -81,7 +81,7 @@ static uint8_t ascii_to_sseg(char c)
 
 		case 'f':
 		case 'F':
-			return 0x47;
+			return 0x17;
 
 		case '#':
 			return 0x66;
@@ -99,6 +99,10 @@ static uint8_t ascii_to_sseg(char c)
 		case 'H':
 			return 0x67;
 
+		case 'n':
+		case 'N':
+			return 0x45;
+
 		case ' ':
 			return 0x00;