Chapter 2. Writing a Module, Page 23

Location on the page: 
two thirds down
Chapter: 
2. Writing a Module
Error: 

In the downloadable code, hook_install() is missing the line to delete the module's variable.

Correction: 

Update online code to include:
variable_del('annotate_node_types')

Description of the Error: 

Omission from online code.

[Fixed in downloadable code. -JV]