Clarify FDW documentation about ON CONFLICT.

Etsuro Fujita, reviewed by Peter Geoghegan

diff --git a/doc/src/sgml/fdwhandler.sgml b/doc/src/sgml/fdwhandler.sgml
index 1dac7ad11eda5523a3ed767ace02215244569b9b..4c410c791689e4e958985c700047ed3f7d352cfd 100644 (file)
--- a/doc/src/sgml/fdwhandler.sgml
+++ b/doc/src/sgml/fdwhandler.sgml
@@ -1196,9 +1196,10 @@ GetForeignServerByName(const char *name, bool missing_ok);
 
     
      INSERT with an ON CONFLICT clause does not
-     support specifying the conflict target, as remote constraints are not
-     locally known. This in turn implies that ON CONFLICT DO
-     UPDATE is not supported, since the specification is mandatory there.
+     support specifying the conflict target, as unique constraints or
+     exclusion constraints on remote tables are not locally known. This
+     in turn implies that ON CONFLICT DO UPDATE is not supported,
+     since the specification is mandatory there.