diff --git a/man/remind.1 b/man/remind.1
index 4c610ef5..66111f49 100644
--- a/man/remind.1
+++ b/man/remind.1
@@ -2011,9 +2011,11 @@ for years greater than 2037.
 .TP
 .B $FormWidth
 The maximum width of each line of text for formatting \fBMSF\fR-type
-reminders.  The default is 72.  If an \fBMSF\fR-type reminder contains
-a word too long to fit in this width, it will not be truncated - the
-width limit will be ignored.
+reminders.  The default is the width of the terminal in columns, minus
+8, but clamped at a minimum of 20 and a maximum of 132.  If standard
+output is not a terminal, then the default is 72.If an \fBMSF\fR-type
+reminder contains a word too long to fit in this width, it will not be
+truncated - the width limit will be ignored.
 .TP
 .B $HushMode (read-only)
 If non-zero, then the \fB\-h\fR option was supplied on the command line.