Chapter 2. Writing a Module, Page 30

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

After creating new variables ('annotate_limit_per_node' and 'annotate_deletion') the .install file should be updated to delete those variables on uninstall.

Correction: 

Either instructions on what to add to annotate.install or just a brief note to remind the reader to do so would be helpful.