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diff --git a/doc/guix.texi b/doc/guix.texi
index a669464feb..f9c9f2ab93 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -4038,10 +4038,23 @@ reports information based on information about the available substitutes
(@pxref{Substitutes}). This allows it to profile disk usage of store
items that are not even on disk, only available remotely.
-A single option is available:
+The available options are:
@table @option
+@item --map-file=@var{file}
+Write to @var{file} a graphical map of disk usage as a PNG file.
+
+For the example above, the map looks like this:
+
+@image{images/coreutils-size-map,5in,, map of Coreutils disk usage
+produced by @command{guix size}}
+
+This option requires that
+@uref{http://wingolog.org/software/guile-charting/, Guile-Charting} be
+installed and visible in Guile's module search path. When that is not
+the case, @command{guix size} fails as it tries to load it.
+
@item --system=@var{system}
@itemx -s @var{system}
Consider packages for @var{system}---e.g., @code{x86_64-linux}.