diff --git a/doc/src/sgml/ref/commit_prepared.sgml b/doc/src/sgml/ref/commit_prepared.sgml
index 2af677fcb0..ecd0c525f2 100644
--- a/doc/src/sgml/ref/commit_prepared.sgml
+++ b/doc/src/sgml/ref/commit_prepared.sgml
@@ -83,6 +83,18 @@ COMMIT PREPARED 'foobar';
+
+ Compatibility
+
+
+ COMMIT PREPARED is a
+ PostgreSQL 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.
+
+
+
See Also
diff --git a/doc/src/sgml/ref/prepare_transaction.sgml b/doc/src/sgml/ref/prepare_transaction.sgml
index a10aa35d38..a379819a0a 100644
--- a/doc/src/sgml/ref/prepare_transaction.sgml
+++ b/doc/src/sgml/ref/prepare_transaction.sgml
@@ -156,6 +156,18 @@ PREPARE TRANSACTION 'foobar';
+
+ Compatibility
+
+
+ PREPARE TRANSACTION is a
+ PostgreSQL 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.
+
+
+
See Also
diff --git a/doc/src/sgml/ref/rollback_prepared.sgml b/doc/src/sgml/ref/rollback_prepared.sgml
index 9592b92f32..514e5ae441 100644
--- a/doc/src/sgml/ref/rollback_prepared.sgml
+++ b/doc/src/sgml/ref/rollback_prepared.sgml
@@ -83,6 +83,18 @@ ROLLBACK PREPARED 'foobar';
+
+ Compatibility
+
+
+ ROLLBACK PREPARED is a
+ PostgreSQL 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.
+
+
+
See Also