[DOCS] Doc 8.4 Part 2 - Cap 6 : Data Manipulation ( about Triggers and Rewrite Rules )

[Bruno Guimarães Carneiro]

 http://www.postgresql.org/docs/8.4/interactive/dml.html

In this chapter we find:

> *We also introduce ways to effect automatic data changes when certain
> events occur: triggers and rewrite rules.*


 But i didnt find anything about triggers and rewrite rules.

Is it incomplete?