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diff --git a/pkg/tbtables/tbhckn.x b/pkg/tbtables/tbhckn.x
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+include <ctype.h>	# IS_LOWER, TO_UPPER
+include <tbset.h>
+include "tbtables.h"
+
+# tbhckn -- change keyword name
+# This routine changes the name of a keyword without changing either
+# the data type, value, or comment.
+#
+# The current keyword can be specified either by name or number,
+# but not both.
+#
+# Phil Hodge, 22-May-1996  Subroutine created.
+# Phil Hodge,  7-Jun-1999  Handle text tables.
+
+procedure tbhckn (tp, oldkey, parnum, newkey)
+
+pointer tp			# i: pointer to table descriptor
+char	oldkey[ARB]		# i: current keyword name
+int	parnum			# i: number of current keyword
+char	newkey[ARB]		# i: new keyword name
+#--
+pointer sp
+pointer par			# buffer for parameter record
+char	uc_oldkey[SZ_KEYWORD]	# old keyword converted to upper case
+char	uc_newkey[SZ_KEYWORD]
+int	i, k
+bool	foundit			# true if oldkey found in table
+int	len, strlen()
+bool	tbhkeq()
+errchk	tbhrpr, tbhwpr, tbfckn
+
+begin
+	len = strlen (newkey)
+	if (len > SZ_KEYWORD)
+	    call error (1, "tbhckn:  new keyword name is too long")
+
+	if (oldkey[1] != EOS && parnum > 0)
+	    call error (1, "tbhckn:  may not specify both name and number")
+
+	if (TB_TYPE(tp) == TBL_TYPE_FITS) {
+	    call tbfckn (tp, oldkey, parnum, newkey)
+	    return
+	}
+
+	call smark (sp)
+	call salloc (par, SZ_PARREC, TY_CHAR)
+
+	call strcpy (oldkey, uc_oldkey, SZ_KEYWORD)
+	call strcpy (newkey, uc_newkey, SZ_KEYWORD)
+	call strupr (uc_oldkey)
+	call strupr (uc_newkey)
+
+	if (parnum > 0) {	# current parameter was specified by number
+
+	    k = parnum
+	    call tbhrpr (tp, k, Memc[par])		# read parameter record
+
+	} else {		# current parameter was specified by name
+
+	    foundit = false
+	    do k = 1, TB_NPAR(tp) {
+
+		call tbhrpr (tp, k, Memc[par])		# read parameter record
+
+		if (tbhkeq (uc_oldkey, Memc[par])) {	# keywords equal?
+		    foundit = true
+		    break
+		}
+	    }
+
+	    if (!foundit) {
+		call sprintf (Memc[par], SZ_PARREC,
+			    "tbhckn:  keyword `%s' not found")
+		    call pargstr (oldkey)
+		call error (1, Memc[par])
+	    }
+	}
+
+	do i = 1, len				# replace old keyword
+	    Memc[par+i-1] = uc_newkey[i]
+	do i = len+1, SZ_KEYWORD
+	    Memc[par+i-1] = ' '
+
+	call tbhwpr (tp, k, Memc[par])		# write parameter record
+
+	call sfree (sp)
+end