diff --git a/Documentation/RelNotes/2.21.0.txt b/Documentation/RelNotes/2.21.0.txt
index 702ebfcdc3..7a49deddf3 100644
--- a/Documentation/RelNotes/2.21.0.txt
+++ b/Documentation/RelNotes/2.21.0.txt
@@ -180,6 +180,13 @@ Performance, Internal Implementation, Development Support etc.
 
  * A flakey "p4" test has been removed.
 
+ * The code and tests assume that the system supplied iconv() would
+   always use BOM in its output when asked to encode to UTF-16 (or
+   UTF-32), but apparently some implementations output big-endian
+   without BOM.  A compile-time knob has been added to help such
+   systems (e.g. NonStop) to add BOM to the output to increase
+   portability.
+
 
 Fixes since v2.20
 -----------------
@@ -439,3 +446,6 @@ Fixes since v2.20
    (merge 2e285e7803 tz/gpg-test-fix later to maint).
    (merge 5427de960b kl/pretty-doc-markup-fix later to maint).
    (merge 3815f64b0d js/mingw-host-cpu later to maint).
+   (merge 5fe81438b5 rj/sequencer-sign-off-header-static later to maint).
+   (merge 18a4f6be6b nd/fileno-may-be-macro later to maint).
+   (merge 99e9ab54ab kd/t0028-octal-del-is-377-not-777 later to maint).