+RRDtool uses Pango for its font handling. This means you can to use
+the full Pango syntax when selecting your font:
+
+The font name has the form "[I<FAMILY-LIST>] [I<STYLE-OPTIONS>] [I<SIZE>]",
+where I<FAMILY-LIST> is a comma separated list of families optionally
+terminated by a comma, I<STYLE_OPTIONS> is a whitespace separated list of
+words where each WORD describes one of style, variant, weight, stretch, or
+gravity, and I<SIZE> is a decimal number (size in points) or optionally
+followed by the unit modifier "px" for absolute size. Any one of the options
+may be absent.
+
+[B<-R>|B<--font-render-mode> {B<normal>,B<light>,B<mono>}]
+
+There are 3 font render modes:
+
+B<normal>: Full Hinting and Antialiasing (default)
+
+B<light>: Slight Hinting and Antialiasing
+
+B<mono>: Full Hinting and NO Antialiasing
+
+
+[B<-B>|B<--font-smoothing-threshold> I<size>]
+
+(this gets ignored in 1.3 for now!)
+
+This specifies the largest font size which will be rendered
+bitmapped, that is, without any font smoothing. By default,
+no text is rendered bitmapped.
+
+[B<-P>|B<--pango-markup>]
+
+All text in rrdtool is rendered using Pango. With the B<--pango-markup> option, all
+text will be processed by pango markup. This allows to embed some simple html
+like markup tags using
+
+ <span key="value">text</span>
+
+Apart from the verbose syntax, there are also the following short tags available.
+
+ b Bold
+ big Makes font relatively larger, equivalent to <span size="larger">
+ i Italic
+ s Strikethrough
+ sub Subscript
+ sup Superscript
+ small Makes font relatively smaller, equivalent to <span size="smaller">
+ tt Monospace font
+ u Underline
+
+More details on L<http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html>.
+
+[B<-G>|B<--graph-render-mode> {B<normal>,B<mono>}]
+
+There are 2 render modes:
+
+B<normal>: Graphs are fully Antialiased (default)
+
+B<mono>: No Antialiasing
+
+[B<-E>|B<--slope-mode>]
+
+RRDtool graphs are composed of stair case curves by default. This is in line with
+the way RRDtool calculates its data. Some people favor a more 'organic' look
+for their graphs even though it is not all that true.