diff --git a/doc/LPCXPresso_Flash_Debug_Tutorial.odt b/doc/LPCXPresso_Flash_Debug_Tutorial.odt
new file mode 100644
index 00000000..fe9dca9a
Binary files /dev/null and b/doc/LPCXPresso_Flash_Debug_Tutorial.odt differ
diff --git a/doc/LPCXPresso_Flash_Debug_Tutorial.pdf b/doc/LPCXPresso_Flash_Debug_Tutorial.pdf
new file mode 100644
index 00000000..a00c5a5a
Binary files /dev/null and b/doc/LPCXPresso_Flash_Debug_Tutorial.pdf differ
diff --git a/firmware/startup_systick/startup_systick.c b/firmware/startup_systick/startup_systick.c
index b80a1b59..ab7cd9fd 100644
--- a/firmware/startup_systick/startup_systick.c
+++ b/firmware/startup_systick/startup_systick.c
@@ -275,7 +275,7 @@ u32 test_nb_instruction_per_sec(void)
 		asm volatile ("nop ");
 		asm volatile ("nop ");
 		asm volatile ("nop ");
-		nb_instructions_per_sec += 100;
+		nb_instructions_per_sec += 108;
 
         end = sys_tick_get_time_ms();
         tickms = sys_tick_delta_time_ms(start, end);