-.\" $Id: mdoc.3,v 1.9 2009/02/23 15:19:47 kristaps Exp $
+.\" $Id: mdoc.3,v 1.10 2009/02/24 13:46:54 kristaps Exp $
.\"
.\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@kth.se>
.\"
.\" TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
.\" PERFORMANCE OF THIS SOFTWARE.
.\"
-.Dd $Mdocdate: February 23 2009 $
+.Dd $Mdocdate: February 24 2009 $
.Dt mdoc 3
.Os
.\" SECTION
.Sx Functions
and
.Sx Variables
-available to programmers. The last sub-section,
+available to programmers. Following that,
+.Sx Character Encoding
+describes input format. Lastly,
.Sx Abstract Syntax Tree ,
documents the output tree.
.\" SUBSECTION
An array of string-ified token argument names.
.El
.\" SUBSECTION
+.Ss Character Encoding
+The
+.Xr mdoc 3
+library accepts only printable ASCII characters as defined by
+.Xr isprint 3 .
+Non-ASCII character sequences are escaped with an escape character
+.Sq \\
+and followed by either an open-parenthesis
+.Sq \&(
+for two-character sequences; an open-bracket
+.Sq \&[
+for n-character sequences (terminated at a close-bracket
+.Sq \&] ) ;
+or one of a small set of single characters for other escapes.
+.\" SUBSECTION
.Ss Abstract Syntax Tree
The
.Nm