1 files changed, 4 insertions(+), 0 deletions(-)

M message/header.ha

@@ 29,6 29,10 @@ export type header_field = struct {
 
 // Creates a new message header. The representation is idempotent, such that
 // whitespace and field ordering is preserved.
+//
+// To preserve DKIM signatures, the only supported operations are [[header_add]]
+// and [[header_add_raw]], which add a new header to the top of the message, and
+// [[header_del]].
 export fn new_header() header = {
 	return header { ... };
 };