documentation issue - extensions

Hello

I am trying to create simple extension according to doc
http://www.postgresql.org/docs/9.1/interactive/extend-extensions.html

I have a problem with line that contains backslash statement

-- complain if script is sourced in psql, rather than via CREATE
EXTENSION
\echo Use "CREATE EXTENSION pair" to load this file. \quit

this content causes a error

postgres=# create extension gdlib;
ERROR: syntax error at or near "\"

without this line extension is created fine.

Is documentation correct?

Regards

Pavel