diff --git a/doc/src/sgml/filelist.sgml b/doc/src/sgml/filelist.sgml
index fef9584f908e..0b5fa7ea74b7 100644
--- a/doc/src/sgml/filelist.sgml
+++ b/doc/src/sgml/filelist.sgml
@@ -17,7 +17,10 @@
 <!ENTITY datatype   SYSTEM "datatype.sgml">
 <!ENTITY ddl        SYSTEM "ddl.sgml">
 <!ENTITY dml        SYSTEM "dml.sgml">
-<!ENTITY func       SYSTEM "func.sgml">
+
+<!ENTITY % allfiles_func   SYSTEM "func/allfiles.sgml">
+%allfiles_func;
+
 <!ENTITY indices    SYSTEM "indices.sgml">
 <!ENTITY json       SYSTEM "json.sgml">
 <!ENTITY mvcc       SYSTEM "mvcc.sgml">
diff --git a/doc/src/sgml/func/allfiles.sgml b/doc/src/sgml/func/allfiles.sgml
new file mode 100644
index 000000000000..34eec608ad63
--- /dev/null
+++ b/doc/src/sgml/func/allfiles.sgml
@@ -0,0 +1,40 @@
+<!--
+doc/src/sgml/func/allfiles.sgml
+PostgreSQL documentation
+Complete list of usable sgml source files in this directory.
+-->
+
+<!-- function references -->
+
+<!ENTITY func                       SYSTEM "func.sgml">
+<!ENTITY func-logical               SYSTEM "func-logical.sgml">
+<!ENTITY func-comparison            SYSTEM "func-comparison.sgml">
+<!ENTITY func-math                  SYSTEM "func-math.sgml">
+<!ENTITY func-string                SYSTEM "func-string.sgml">
+<!ENTITY func-binarystring          SYSTEM "func-binarystring.sgml">
+<!ENTITY func-bitstring             SYSTEM "func-bitstring.sgml">
+<!ENTITY func-matching              SYSTEM "func-matching.sgml">
+<!ENTITY func-formatting            SYSTEM "func-formatting.sgml">
+<!ENTITY func-datetime              SYSTEM "func-datetime.sgml">
+<!ENTITY func-enum                  SYSTEM "func-enum.sgml">
+<!ENTITY func-geometry              SYSTEM "func-geometry.sgml">
+<!ENTITY func-net                   SYSTEM "func-net.sgml">
+<!ENTITY func-textsearch            SYSTEM "func-textsearch.sgml">
+<!ENTITY func-uuid                  SYSTEM "func-uuid.sgml">
+<!ENTITY func-xml                   SYSTEM "func-xml.sgml">
+<!ENTITY func-json                  SYSTEM "func-json.sgml">
+<!ENTITY func-sequence              SYSTEM "func-sequence.sgml">
+<!ENTITY func-conditional           SYSTEM "func-conditional.sgml">
+<!ENTITY func-array                 SYSTEM "func-array.sgml">
+<!ENTITY func-range                 SYSTEM "func-range.sgml">
+<!ENTITY func-aggregate             SYSTEM "func-aggregate.sgml">
+<!ENTITY func-window                SYSTEM "func-window.sgml">
+<!ENTITY func-merge-support         SYSTEM "func-merge-support.sgml">
+<!ENTITY func-subquery              SYSTEM "func-subquery.sgml">
+<!ENTITY func-comparisons           SYSTEM "func-comparisons.sgml">
+<!ENTITY func-srf                   SYSTEM "func-srf.sgml">
+<!ENTITY func-info                  SYSTEM "func-info.sgml">
+<!ENTITY func-admin                 SYSTEM "func-admin.sgml">
+<!ENTITY func-trigger               SYSTEM "func-trigger.sgml">
+<!ENTITY func-event-triggers        SYSTEM "func-event-triggers.sgml">
+<!ENTITY func-statistics            SYSTEM "func-statistics.sgml">
\ No newline at end of file