--- a/src/backend/executor/README
+++ b/src/backend/executor/README
@@ -37,6 +37,16 @@ the plan tree returns the computed tuples to be updated, plus a "junk"
 one.  For DELETE, the plan tree need only deliver a CTID column, and the
 ModifyTable node visits each of those rows and marks the row deleted.

+MERGE runs one generic plan that returns candidate target rows. Each row
+consists of a super-row that contains all the columns needed by any of the
+individual actions, plus a CTID and a TABLEOID junk columns. The CTID column is