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-rw-r--r--doc/src/sgml/ref/insert.sgml9
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/insert.sgml b/doc/src/sgml/ref/insert.sgml
index 3f139917790..b337f2ee555 100644
--- a/doc/src/sgml/ref/insert.sgml
+++ b/doc/src/sgml/ref/insert.sgml
@@ -594,6 +594,15 @@ INSERT INTO <replaceable class="parameter">table_name</replaceable> [ AS <replac
</para>
</tip>
+ <warning>
+ <para>
+ While <command>CREATE INDEX CONCURRENTLY</command> or <command>REINDEX
+ CONCURRENTLY</command> is running on a unique index, <command>INSERT
+ ... ON CONFLICT</command> statements on the same table may unexpectedly
+ fail with a unique violation.
+ </para>
+ </warning>
+
</refsect2>
</refsect1>