-To attach multiple files, separating filenames and recipient addresses with
-"\-\-" is mandatory, e.g. \fBmutt \-a img.jpg *.png \-\- addr1 addr2\fP.
+When attaching single or multiple files, separating filenames and recipient addresses with
+"\-\-" is mandatory, e.g. \fBmutt -a image.jpg \-\- addr1\fP or
+\fBmutt \-a img.jpg *.png \-\- addr1 addr2\fP.
+The \-a option must be placed at the end of command line options.