doc: mention libpq regression tests

Reported-by: Ryo Matsumura
Discussion: https://postgr.es/m/TYCPR01MB11316B3FB56EE54D70BF0CEF6E8E4A@TYCPR01MB11316.jpnprd01.prod.outlook.com

Backpatch-through: 11

diff --git a/doc/src/sgml/regress.sgml b/doc/src/sgml/regress.sgml
index 675db86e4d79e8c1a969d099cc04ec9e5ccee1d5..de065c0564a588b8e6e4590740dff101578336c8 100644 (file)
--- a/doc/src/sgml/regress.sgml
+++ b/doc/src/sgml/regress.sgml
@@ -196,8 +196,9 @@ make check-world -j8 >/dev/null
    </listitem>
    <listitem>
     <para>
-     Regression tests for the ECPG interface library,
-     located in <filename>src/interfaces/ecpg/test</filename>.
+     Regression tests for the interface libraries,
+     located in <filename>src/interfaces/libpq/test</filename> and
+     <filename>src/interfaces/ecpg/test</filename>.
     </para>
    </listitem>
    <listitem>