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-rw-r--r--Doc/library/email.encoders.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Doc/library/email.encoders.rst b/Doc/library/email.encoders.rst
index 5421b9f66f..3c32c3bb42 100644
--- a/Doc/library/email.encoders.rst
+++ b/Doc/library/email.encoders.rst
@@ -18,6 +18,10 @@ exactly one argument, the message object to encode. They usually extract the
payload, encode it, and reset the payload to this newly encoded value. They
should also set the :mailheader:`Content-Transfer-Encoding` header as appropriate.
+Note that these functions are not meaningful for a multipart message. They
+must be applied to individual subparts instead, and will throw a
+:exc:`TypeError` if passed a message whose type is multipart.
+
Here are the encoding functions provided: