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-rw-r--r--doc/src/sgml/ref/commit_prepared.sgml12
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diff --git a/doc/src/sgml/ref/commit_prepared.sgml b/doc/src/sgml/ref/commit_prepared.sgml
index 2af677fcb06..ecd0c525f20 100644
--- a/doc/src/sgml/ref/commit_prepared.sgml
+++ b/doc/src/sgml/ref/commit_prepared.sgml
@@ -84,6 +84,18 @@ COMMIT PREPARED 'foobar';
</refsect1>
<refsect1>
+ <title>Compatibility</title>
+
+ <para>
+ <command>COMMIT PREPARED</command> is a
+ <productname>PostgreSQL</productname> extension. It is intended for use by
+ external transaction management systems, some of which are covered by
+ standards (such as X/Open XA), but the SQL side of those systems is not
+ standardized.
+ </para>
+ </refsect1>
+
+ <refsect1>
<title>See Also</title>
<simplelist type="inline">