diff --git a/Laser-Controller.md b/Laser-Controller.md
index 0b2f56b..3ca3b4c 100644
--- a/Laser-Controller.md
+++ b/Laser-Controller.md
@@ -30,8 +30,8 @@ The Pico laser controller understands the commands in the table below.  Any othe
 | f.[x]                 | Set the center frequency to *x*.           |
 | f.?                   | Return the current center frequency.       |
 |                       | The center frequency = green freuquency.   |
-|                       | Blue freq. is set to *x* - 2 Hz.           |
-|                       | Red freq. is set to *x* + 2 Hz.            |
+|                       | Blue freq. is set to *x* - 3 Hz.           |
+|                       | Red freq. is set to *x* + 3 Hz.            |
 | [b/g/r].[**on**/off] | Turn the blue/green/red laser on/off.  |
 | sweep.[n]             | Conduct a frequency sweep in range center freq. +/- *n* |
 | toggle.[**on**/off]   | Toggle the indicator LED on/off.         |