Exclude constraints not shown ALTER TABLE documentation page

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.5/static/sql-altertable.html
Description:

Minor documentation feedback:
Though it is possible to add EXCLUDE CONSTRAINTs via ALTER TABLE as appears
here
http://thoughts.davisjeff.com/2010/09/25/exclusion-constraints-are-generalized-sql-unique/
we could not see it on the related doc here
https://www.postgresql.org/docs/9.5/static/sql-altertable.html