diff --git a/doc/src/sgml/regress.sgml b/doc/src/sgml/regress.sgml
index 675db86..6f046d9 100644
--- 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 library,
+     located in <filename>src/interfaces/ecpg/test</filename> and
+     <filename>src/interfaces/libpq/test</filename>.
     </para>
    </listitem>
    <listitem>