diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 4e1372f789..6567347acc 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -3661,8 +3661,8 @@ Oid PQftype(const PGresult *res,
        You can query the system table <literal>pg_type</literal> to
        obtain the names and properties of the various data types. The
        <acronym>OID</acronym>s of the built-in data types are defined
-       in the file <filename>src/include/catalog/pg_type_d.h</filename>
-       in the source tree.
+       in the file <filename>include/catalog/pg_type_d.h</filename>
+       in the compiled source directory and install directory.
       </para>
      </listitem>
     </varlistentry>