diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index de272c5..36240f6 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -6951,7 +6951,7 @@ myEventProc(PGEventId evtId, void *evtInfo, void *passThrough)
    The connection service file can be a per-user service file
    at <filename>~/.pg_service.conf</filename> or the location
    specified by the environment variable <envar>PGSERVICEFILE</envar>,
-   or it can be a system-wide file
+   or it can be a system-wide under the output of <command>pg_config --sysconfig</command>, frequently
    at <filename>/etc/pg_service.conf</filename> or in the directory
    specified by the environment variable
    <envar>PGSYSCONFDIR</envar>.  If service definitions with the same