diff --git a/Config.h b/Config.h
index 28bcc03..0947fb2 100644
--- a/Config.h
+++ b/Config.h
@@ -22,12 +22,14 @@
 // Allow for the use of high quality external clock oscillators
 // The number is the frequency of the oscillator in Hertz.
 //
-// The frequency of the TCXO must be an integer multiple of 24000.
-// Frequencies such as 12.0 Mhz (24000 * 500) and 14.4 Mhz ( 24000 *600) are suitable.
-// Frequencies such as 10.0 Mhz (24000 * 416.666) or 20 Mhz (24000 * 833.333) are not suitable.
+// The frequency of the TCXO must be an integer multiple of 48000.
+// Frequencies such as 12.0 Mhz (48000 * 250) and 14.4 Mhz (48000 * 300) are suitable.
+// Frequencies such as 10.0 Mhz (48000 * 208.333) or 20 Mhz (48000 * 416.666) are not suitable.
 //
 // For 12 MHz
 // #define EXTERNAL_OSC 12000000
+// For 12.288 MHz
+// #define EXTERNAL_OSC 12288000
 // For 14.4 MHz
 // #define EXTERNAL_OSC 14400000
 // For 19.2 MHz