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diff --git a/man/define_key.3x b/man/define_key.3x
index 79a82052..d87b8f57 100644
--- a/man/define_key.3x
+++ b/man/define_key.3x
@@ -1,5 +1,5 @@
 .\"***************************************************************************
-.\" Copyright (c) 1998 Free Software Foundation, Inc.                        *
+.\" Copyright (c) 1998-2006,2009 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            *
@@ -26,19 +26,16 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
-.\" Author: Thomas E. Dickey <dickey@clark.net> 1997
+.\" Author: Thomas E. Dickey 1997
 .\"
-.\" $Id: define_key.3x,v 1.4 1998/02/11 12:13:48 tom Exp $
+.\" $Id: define_key.3x,v 1.13 2009/09/19 21:09:35 tom Exp $
 .TH define_key 3X ""
-.
 .SH NAME
 \fBdefine_key\fP \- define a keycode
-.
 .SH SYNOPSIS
 \fB#include <curses.h>\fP
-
-\fBint define_key(char *definition, int keycode);\fP
-.
+.sp
+\fBint define_key(const char *definition, int keycode);\fP
 .SH DESCRIPTION
 This is an extension to the curses library.
 It permits an application to define keycodes with their corresponding control
@@ -47,18 +44,21 @@ the predefined codes in the terminfo database.
 .PP
 If the given string is null, any existing definition for the keycode is
 removed.
-.
+Similarly, if the given keycode is negative or zero, any existing string
+for the given definition is removed.
 .SH RETURN VALUE
-The keycode must be greater than zero, else ERR is returned.
-.
+The keycode must be greater than zero, and the string non-null,
+otherwise ERR is returned.
+ERR may also be returned if there is insufficient memory to allocate the
+data to store the definition.
+If no error is detected, OK 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.
-.
 .SH SEE ALSO
-\fBkeyok\fR(3X).
-.
+\fBkeyok\fR(3X),
+\fBkey_defined\fR(3X).
 .SH AUTHOR
 Thomas Dickey.
 .\"#