Chapter 3. Hooks, Actions, and Triggers, Page 53

Location on the page: 
Block of code after 1st paragraph
Chapter: 
3. Hooks, Actions, and Triggers
Error: 

"Beep multiple times" callback function as in the table description is printed in book as "beep_beep_action".

Correction: 

Should be:
callback: 'beep_multiple_beep_action'

Description of the Error: 

Point is made clear -- just a small oversight on what the callback function of the configurable function 'beep_multiple_beep_action' is as opposed to the chapters non-configurable counterpart, 'beep_beep_action'.