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<chapter id="libpq-chapter">
<term><literal>host</literal></term>
<listitem>
<para>
- Name of host to connect to. If a non-zero-length string is
- specified, TCP/IP communication is used, else Unix sockets.
+ Name of host to connect to.
Using this parameter causes a hostname look-up. See hostaddr.
+ If it begins with a slash, it is used
+ as the path to a unix domain socket.
</para>
</listitem>
</varlistentry>
<listitem>
<para>
<envar>PGHOST</envar> sets the default server name.
-If a non-zero-length string is specified, TCP/IP communication is used.
+If it beings with a slash, it is used as the path to a unix domain
+socket.
Without a host name, libpq will connect using a local Unix domain socket.
</para>
</listitem>