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-rw-r--r--doc/src/sgml/postgres-fdw.sgml4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/src/sgml/postgres-fdw.sgml b/doc/src/sgml/postgres-fdw.sgml
index 6a91926da83..9adc8d12a9d 100644
--- a/doc/src/sgml/postgres-fdw.sgml
+++ b/doc/src/sgml/postgres-fdw.sgml
@@ -493,7 +493,9 @@ OPTIONS (ADD password_required 'false');
each connection is valid or not. <literal>false</literal> is returned
if the foreign server connection is used in the current local
transaction but its foreign server or user mapping is changed or
- dropped, and then such invalid connection will be closed at
+ dropped (Note that server name of an invalid connection will be
+ <literal>NULL</literal> if the server is dropped),
+ and then such invalid connection will be closed at
the end of that transaction. <literal>true</literal> is returned
otherwise. If there are no open connections, no record is returned.
Example usage of the function: