diff --git a/redshift.1 b/redshift.1
index 579fa8e..dfdc9c0 100644
--- a/redshift.1
+++ b/redshift.1
@@ -21,6 +21,10 @@ temperature at around 3000K\-4000K (default is 4500K). During the day,
 the color temperature should match the light from outside, typically
 around 5500K\-6500K (default is 6500K). The light has a higher
 temperature on an overcast day.
+.PP
+In addition to the command-line tool \fBredshift\fR, the GUI
+\fBredshift-gtk\fR provides an alternative interface that shows up as a
+notification icon in the desktop environment.
 .SH OPTIONS
 .TP
 \fB\-h\fR