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-rw-r--r--doc/src/sgml/tutorial.sgml2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/src/sgml/tutorial.sgml b/doc/src/sgml/tutorial.sgml
index 6ff48eb750e..5873a377726 100644
--- a/doc/src/sgml/tutorial.sgml
+++ b/doc/src/sgml/tutorial.sgml
@@ -12,7 +12,7 @@
<!entity advanced SYSTEM "advanced.sgml">
<!entity biblio SYSTEM "biblio.sgml">
]>
-<Book>
+<Book Id="tutorial">
<!-- Title information -->