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-rw-r--r--doc/src/sgml/xaggr.sgml2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/src/sgml/xaggr.sgml b/doc/src/sgml/xaggr.sgml
index 81df0a8577..b4d9aa4402 100644
--- a/doc/src/sgml/xaggr.sgml
+++ b/doc/src/sgml/xaggr.sgml
@@ -1,4 +1,4 @@
-<Chapter>
+<Chapter Id="xaggr">
<Title>Extending <Acronym>SQL</Acronym>: Aggregates</Title>
<Para>