@table @code
@item message-forward-ignored-headers
@vindex message-forward-ignored-headers
-All headers that match this regexp will be deleted when forwarding a message.
+In non-@code{nil}, all headers that match this regexp will be deleted
+when forwarding a message.
+
+@item message-forward-included-headers
+@vindex message-forward-included-headers
+In non-@code{nil}, only headers that match this regexp will be kept
+when forwarding a message.
@item message-make-forward-subject-function
@vindex message-make-forward-subject-function