From the PR:

The description of -X option in csh(1) manpage uses a wording
  that references the descriptions of -x, -v and -V.  This might
  be a little confusing.  Changed this to a complete description
  that does not reference other paragraphs.

PR:		16762
Submitted:	Giorgos Keramidas <keramida@ceid.upatras.gr>

bin/csh/csh.1

@@ -132,12 +132,11 @@ variable to be set even before
 .Pa .cshrc
 is executed.
 .It Fl X
-Is to
-.Fl x
-as
-.Fl V
-is to
-.Fl v .
+Cause the
+.Ar echo
+variable to be set even before
+.Pa .cshrc
+is executed.
 .El
 .Pp
 After processing of flag arguments, if arguments remain but none of the