diff --git a/PyGreSQL.spec b/PyGreSQL.spec
index f18dfc7..ba792e8 100644
--- a/PyGreSQL.spec
+++ b/PyGreSQL.spec
@@ -97,6 +97,8 @@ exit 0
 
 cat > LOCAL_PyGreSQL.py <<EOF
 dbname = '${PGTESTS_DATABASES##*:}'
+# Per https://mail.vex.net/mailman/private.cgi/pygresql/2017-July/003446.html
+# advice to leave 'dbhost' empty.
 dbhost = ''
 dbport = $PGPORT
 EOF