diff --git a/man/key_defined.3x b/man/key_defined.3x
index db6c531..f0184aa 100644
--- a/man/key_defined.3x
+++ b/man/key_defined.3x
@@ -1,5 +1,6 @@
 .\"***************************************************************************
-.\" Copyright (c) 2003-2006,2010 Free Software Foundation, Inc.              *
+.\" Copyright 2018-2023,2024 Thomas E. Dickey                                *
+.\" Copyright 2003-2006,2010 Free Software Foundation, Inc.                  *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *
@@ -28,27 +29,33 @@
 .\"
 .\" Author: Thomas E. Dickey 2003
 .\"
-.\" $Id: key_defined.3x,v 1.6 2010/12/04 18:40:45 tom Exp $
-.TH key_defined 3X ""
+.\" $Id: key_defined.3x,v 1.34 2024/03/16 15:35:01 tom Exp $
+.TH key_defined 3X 2024-03-16 "ncurses @NCURSES_MAJOR@.@NCURSES_MINOR@" "Library calls"
 .SH NAME
-\fBkey_defined\fP \- check if a keycode is defined
+\fB\%key_defined\fP \-
+test whether a \fIcurses\fR keycode is defined
 .SH SYNOPSIS
-\fB#include <curses.h>\fP
-.sp
-\fBint key_defined(const char *definition);\fP
+.nf
+\fB#include <curses.h>
+.PP
+\fBint key_defined(const char *\fIdefinition\fP);
+.fi
 .SH DESCRIPTION
-This is an extension to the curses library.
+This is an extension to the \fIcurses\fP library.
 It permits an application to determine if a string is currently bound
 to any keycode.
 .SH RETURN VALUE
 If the string is bound to a keycode, its value (greater than zero) is returned.
 If no keycode is bound, zero is returned.
-If the string conflicts with longer strings which are bound to keys, \-1 is returned.
+If the string conflicts with longer strings
+which are bound to keys, \-1 is returned.
 .SH PORTABILITY
-These routines are specific to ncurses.  They were not supported on
-Version 7, BSD or System V implementations.  It is recommended that
-any code depending on them be conditioned using NCURSES_VERSION.
+This routine is specific to \fI\%ncurses\fP.
+It was not supported on
+Version 7, BSD or System V implementations.
+It is recommended that
+any code depending on them be conditioned using \fB\%NCURSES_VERSION\fP.
+.SH AUTHORS
+Thomas Dickey
 .SH SEE ALSO
-\fBdefine_key\fR(3X).
-.SH AUTHOR
-Thomas Dickey.
+\fB\%define_key\fP(3X)