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-rw-r--r--doc/src/sgml/ref/create_table.sgml4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml
index be7ebd5f54..fac7e1ec5e 100644
--- a/doc/src/sgml/ref/create_table.sgml
+++ b/doc/src/sgml/ref/create_table.sgml
@@ -717,7 +717,9 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXI
<literal>EXCLUDE</>, and
<literal>REFERENCES</> (foreign key) constraints accept this
clause. <literal>NOT NULL</> and <literal>CHECK</> constraints are not
- deferrable.
+ deferrable. Note that deferrable constraints cannot be used as
+ conflict arbitrators in an <command>INSERT</command> statement that
+ includes an <literal>ON CONFLICT DO UPDATE</> clause.
</para>
</listitem>
</varlistentry>