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diff --git a/texi/emacs-mime.texi b/texi/emacs-mime.texi
index 3de34ae..00e8f44 100644
--- a/texi/emacs-mime.texi
+++ b/texi/emacs-mime.texi
@@ -837,12 +837,12 @@ by using the @code{encoding} @acronym{MML} tag (@pxref{MML Definition}).
 @vindex mm-coding-system-priorities
 Prioritize coding systems to use for outgoing messages.  The default
 is @code{nil}, which means to use the defaults in Emacs.  It is a list of
-coding system symbols (aliases of coding systems does not work, use
-@kbd{M-x describe-coding-system} to make sure you are not specifying
-an alias in this variable).  For example, if you have configured Emacs
+coding system symbols (aliases of coding systems are also allowed, use
+@kbd{M-x describe-coding-system} to make sure you are specifying correct
+coding system names).  For example, if you have configured Emacs
 to prefer UTF-8, but wish that outgoing messages should be sent in
 ISO-8859-1 if possible, you can set this variable to
-@code{(iso-latin-1)}.  You can override this setting on a per-message
+@code{(iso-8859-1)}.  You can override this setting on a per-message
 basis by using the @code{charset} @acronym{MML} tag (@pxref{MML Definition}).
 
 @item mm-content-transfer-encoding-defaults
@@ -852,8 +852,18 @@ used except, e.g., when other requirements force a safer encoding
 (digitally signed messages require 7bit encoding).  Besides the normal
 @acronym{MIME} encodings, @code{qp-or-base64} may be used to indicate that for
 each case the most efficient of quoted-printable and base64 should be
-used.  You can override this setting on a per-message basis by using
-the @code{encoding} @acronym{MML} tag (@pxref{MML Definition}).
+used.
+
+@code{qp-or-base64} has another effect.  It will fold long lines so that
+MIME parts may not be broken by MTA.  So do @code{quoted-printable} and
+@code{base64}.
+
+Note that it affects body encoding only when a part is a raw forwarded
+message (which will be made by @code{gnus-summary-mail-forward} with the
+arg 2 for example) or is neither the @samp{text/*} type nor the
+@samp{message/*} type.  Even though in those cases, you can override
+this setting on a per-message basis by using the @code{encoding}
+@acronym{MML} tag (@pxref{MML Definition}).
 
 @item mm-use-ultra-safe-encoding
 @vindex mm-use-ultra-safe-encoding