Update PQntuples now returns rows affected.

src/man/libpq.3

 .\" This is -*-nroff-*-
 .\" XXX standard disclaimer belongs here....
-.\" $Header: /cvsroot/pgsql/src/man/Attic/libpq.3,v 1.4 1996/12/11 00:27:53 momjian Exp $
+.\" $Header: /cvsroot/pgsql/src/man/Attic/libpq.3,v 1.5 1997/10/01 18:14:53 momjian Exp $
 .TH LIBPQ INTRO 03/12/94 PostgreSQL PostgreSQL
 .SH DESCRIPTION
 Libpq is the programmer's interface to Postgres.  Libpq is a set of
@@ -201,7 +201,9 @@ be used to retrieve the tuples returned by the query.
 .IP
 
 .B PQntuples
-returns the number of tuples (instances) in the query result.
+returns the number of tuples (instances) in the query result, or the
+number of rows affected for queries that do not return a tuples.
+
 .nf
 int PQntuples(PGresult *res);
 .fi