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-rw-r--r--doc/src/sgml/postgres.sgml2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/src/sgml/postgres.sgml b/doc/src/sgml/postgres.sgml
index d8ab08600a2..e94e561ee8e 100644
--- a/doc/src/sgml/postgres.sgml
+++ b/doc/src/sgml/postgres.sgml
@@ -1,4 +1,4 @@
-<!doctype book PUBLIC "-//Davenport//DTD DocBook V3.0//EN" [
+<!doctype book PUBLIC "-//OASIS//DTD DocBook V3.1//EN" [
<!entity about SYSTEM "about.sgml">
<!entity bug-reporting SYSTEM "bug-reporting.sgml">