diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 1802330b703..2673684ace3 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1075,6 +1075,10 @@ testdb=>
         destination, because all data must pass through the client/server
         connection.  For large amounts of data the <acronym>SQL</acronym>
         command might be preferable.
+        Also, because of this pass-through method, <literal>\copy
+        ... from</literal> in <acronym>CSV</acronym> mode will erroneously
+        treat a <literal>\.</literal> data value alone on a line as an
+        end-of-input marker.
         </para>
         </tip>
 
diff --git a/src/bin/psql/copy.c b/src/bin/psql/copy.c
index f59db8d7bd0..92934725383 100644
--- a/src/bin/psql/copy.c
+++ b/src/bin/psql/copy.c
@@ -629,6 +629,7 @@ handleCopyIn(PGconn *conn, FILE *copystream, bool isbinary, PGresult **res)
 					 * This code erroneously assumes '\.' on a line alone
 					 * inside a quoted CSV string terminates the \copy.
 					 * https://www.postgresql.org/message-id/E1TdNVQ-0001ju-GO@wrigleys.postgresql.org
+					 * https://www.postgresql.org/message-id/bfcd57e4-8f23-4c3e-a5db-2571d09208e2@beta.fastmail.com
 					 */
 					if (strcmp(buf, "\\.\n") == 0 ||
 						strcmp(buf, "\\.\r\n") == 0)