Log Message:
-----------
Mention palloc/pfree for C++ memory allocation in docs.
Modified Files:
--------------
pgsql/doc/src/sgml:
extend.sgml (r1.40 -> r1.41)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/extend.sgml?r1=1.40&r2=1.41)