diff --git a/runtime/syntax/tcsh.vim b/runtime/syntax/tcsh.vim
index 27c6417..6837125 100644
--- a/runtime/syntax/tcsh.vim
+++ b/runtime/syntax/tcsh.vim
@@ -1,8 +1,9 @@
-" tcsh.vim: Vim syntax file for tcsh scripts
-" Maintainer: Doug Kearns <dougkearns@NoSpam.com> where NoSpam=gmail
-" Author: Gautam Iyer <gi1242+vim@NoSpam.com> where NoSpam=gmail
-" Modified: Sun 26 Sep 2021 12:40:55 PM EDT
-"
+" Vim syntax file
+" Language:		tcsh scripts
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Gautam Iyer <gi1242+vim@NoSpam.com> where NoSpam=gmail (Original Author)
+" Last Change:		2021 Oct 15
+
 " Description: We break up each statement into a "command" and an "end" part.
 " All groups are either a "command" or part of the "end" of a statement (ie
 " everything after the "command"). This is because blindly highlighting tcsh
@@ -20,36 +21,36 @@
 let s:oldcpo = &cpo
 set cpo&vim " Line continuation is used
 
-setlocal iskeyword+=-
+syn iskeyword @,48-57,_,192-255,-
 
 syn case match
 
-" ----- Clusters -----
+" ----- Clusters ----- {{{1
 syn cluster tcshModifiers	contains=tcshModifier,tcshModifierError
 syn cluster tcshQuoteList	contains=tcshDQuote,tcshSQuote,tcshBQuote
-syn cluster tcshStatementEnds	contains=@tcshQuoteList,tcshComment,@tcshVarList,tcshRedir,tcshMeta,tcshHereDoc,tcshSpecial,tcshArguement
+syn cluster tcshStatementEnds	contains=@tcshQuoteList,tcshComment,@tcshVarList,tcshRedir,tcshMeta,tcshHereDoc,tcshSpecial,tcshArgument
 syn cluster tcshStatements	contains=tcshBuiltin,tcshCommands,tcshIf,tcshWhile
 syn cluster tcshVarList		contains=tcshUsrVar,tcshArgv,tcshSubst
 syn cluster tcshConditions	contains=tcshCmdSubst,tcshParenExpr,tcshOperator,tcshNumber,@tcshVarList
 
-" ----- Errors -----
+" ----- Errors ----- {{{1
 " Define first, so can be easily overridden.
 syn match tcshError contained '\v\S.+'
 
-" ----- Statements -----
+" ----- Statements ----- {{{1
 " Tcsh commands: Any filename / modifiable variable (must be first!)
 syn match tcshCommands	'\v[a-zA-Z0-9\\./_$:-]+' contains=tcshSpecial,tcshUsrVar,tcshArgv,tcshVarError nextgroup=tcshStatementEnd
 
 " Builtin commands except those treated specially. Currently (un)set(env),
 " (un)alias, if, while, else, bindkey
-syn keyword tcshBuiltin nextgroup=tcshStatementEnd alloc bg break breaksw builtins bye case cd chdir complete continue default dirs echo echotc end endif endsw eval exec exit fg filetest foreach getspath getxvers glob goto hashstat history hup inlib jobs kill limit log login logout ls ls-F migrate newgrp nice nohup notify onintr popd printenv pushd rehash repeat rootnode sched setpath setspath settc setty setxvers shift source stop suspend switch telltc time umask uncomplete unhash universe unlimit ver wait warp watchlog where which
+syn keyword tcshBuiltin nextgroup=tcshStatementEnd alloc bg break breaksw builtins bye case cd chdir complete continue default dirs echo echotc end endif endsw eval exec exit fg filetest foreach getspath getxvers glob goto hashstat history hup inlib jobs kill limit log login logout ls ls-F migrate newgrp nice nohup notify onintr popd printenv pushd rehash repeat rootnode sched setpath setspath settc setty setxvers shift source stop suspend switch telltc termname time umask uncomplete unhash universe unlimit ver wait warp watchlog where which
 
 " StatementEnd is anything after a built-in / command till the lexical end of a
 " statement (;, |, ||, |&, && or end of line)
 syn region tcshStatementEnd	transparent contained matchgroup=tcshBuiltin start='' end='\v\\@<!(;|\|[|&]?|\&\&|$)' contains=@tcshStatementEnds
 
 " set expressions (Contains shell variables)
-syn keyword tcshShellVar contained afsuser ampm argv autocorrect autoexpand autolist autologout backslash_quote catalog cdpath color colorcat command complete continue continue_args correct cwd dextract dirsfile dirstack dspmbyte dunique echo echo_style edit ellipsis fignore filec gid group histchars histdup histfile histlit history home ignoreeof implicitcd inputmode killdup killring listflags listjobs listlinks listmax listmaxrows loginsh logout mail matchbeep nobeep noclobber noding noglob nokanji nonomatch nostat notify oid owd path printexitvalue prompt prompt2 prompt3 promptchars pushdtohome pushdsilent recexact recognize_only_executables rmstar rprompt savedirs savehist sched shell shlvl status symlinks tcsh term time tperiod tty uid user verbose version visiblebell watch who wordchars
+syn keyword tcshShellVar contained addsuffix afsuser ampm anyerror argv autocorrect autoexpand autolist autologout autorehash backslash_quote catalog cdpath cdtohome color colorcat command compat_expr complete continue continue_args correct csubstnonl cwd dextract dirsfile dirstack dspmbyte dunique echo echo_style edit editors ellipsis euid euser fignore filec gid globdot globstar group highlight histchars histdup histfile histlit history home ignoreeof implicitcd inputmode killdup killring listflags listjobs listlinks listmax listmaxrows loginsh logout mail matchbeep nobeep noclobber noding noglob nokanji nonomatch nostat notify oid owd padhour parseoctal path printexitvalue prompt prompt2 prompt3 promptchars pushdtohome pushdsilent recexact recognize_only_executables rmstar rprompt savedirs savehist sched shell shlvl status symlinks tcsh term time tperiod tty uid user verbose version vimode visiblebell watch who wordchars
 syn keyword tcshBuiltin	nextgroup=tcshSetEnd set unset
 syn region  tcshSetEnd	contained transparent matchgroup=tcshBuiltin start='' skip='\\$' end='$\|;' contains=tcshShellVar,@tcshStatementEnds
 
@@ -96,14 +97,15 @@
 	    \ history-search-forward insert-last-word i-search-fwd
 	    \ i-search-back keyboard-quit kill-line kill-region
 	    \ kill-whole-line list-choices list-choices-raw list-glob
-	    \ list-or-eof load-average magic-space newline normalize-path
-	    \ normalize-command overwrite-mode prefix-meta quoted-insert
-	    \ redisplay run-fg-editor run-help self-insert-command
-	    \ sequence-lead-in set-mark-command spell-word spell-line
-	    \ stuff-char toggle-literal-history transpose-chars
-	    \ transpose-gosling tty-dsusp tty-flush-output tty-sigintr
-	    \ tty-sigquit tty-sigtsusp tty-start-output tty-stop-output
-	    \ undefined-key universal-argument up-history upcase-word
+	    \ list-or-eof load-average magic-space newline newline-and-hold
+	    \ newline-and-down-history normalize-path normalize-command
+	    \ overwrite-mode prefix-meta quoted-insert redisplay
+	    \ run-fg-editor run-help self-insert-command sequence-lead-in
+	    \ set-mark-command spell-word spell-line stuff-char
+	    \ toggle-literal-history transpose-chars transpose-gosling
+	    \ tty-dsusp tty-flush-output tty-sigintr tty-sigquit tty-sigtsusp
+	    \ tty-start-output tty-stop-output undefined-key
+	    \ universal-argument up-history upcase-word
 	    \ vi-beginning-of-next-word vi-add vi-add-at-eol vi-chg-case
 	    \ vi-chg-meta vi-chg-to-eol vi-cmd-mode vi-cmd-mode-complete
 	    \ vi-delprev vi-delmeta vi-endword vi-eword vi-char-back
@@ -116,7 +118,7 @@
 	    \ e_paste_from_clipboard e_dosify_next e_dosify_prev e_page_up
 	    \ e_page_down
 syn keyword tcshBuiltin nextgroup=tcshBindkeyEnd bindkey
-syn region tcshBindkeyEnd contained transparent matchgroup=tcshBuiltin start='' skip='\\$' end='$' contains=@tcshQuoteList,tcshComment,@tcshVarList,tcshMeta,tcshSpecial,tcshArguement,tcshBindkeyFuncs
+syn region tcshBindkeyEnd contained transparent matchgroup=tcshBuiltin start='' skip='\\$' end='$' contains=@tcshQuoteList,tcshComment,@tcshVarList,tcshMeta,tcshSpecial,tcshArgument,tcshBindkeyFuncs
 
 " Expressions start with @.
 syn match tcshExprStart '\v\@\s+' nextgroup=tcshExprVar
@@ -126,20 +128,20 @@
 syn match tcshExprEnd	contained '\v.*$'hs=e+1 contains=@tcshConditions
 syn match tcshExprEnd	contained '\v.{-};'hs=e	contains=@tcshConditions
 
-" ----- Comments: -----
+" ----- Comments: ----- {{{1
 syn match tcshComment	'#\s.*' contains=tcshTodo,tcshCommentTi,@Spell
 syn match tcshComment	'\v#($|\S.*)' contains=tcshTodo,tcshCommentTi
 syn match tcshSharpBang '^#! .*$'
 syn match tcshCommentTi contained '\v#\s*\u\w*(\s+\u\w*)*:'hs=s+1 contains=tcshTodo
 syn match tcshTodo	contained '\v\c<todo>'
 
-" ----- Strings -----
+" ----- Strings ----- {{{1
 " Tcsh does not allow \" in strings unless the "backslash_quote" shell
 " variable is set. Set the vim variable "tcsh_backslash_quote" to 0 if you
 " want VIM to assume that no backslash quote constructs exist.
 
 " Backquotes are treated as commands, and are not contained in anything
-if(exists('tcsh_backslash_quote') && tcsh_backslash_quote == 0)
+if exists('tcsh_backslash_quote') && tcsh_backslash_quote == 0
     syn region tcshSQuote	keepend contained start="\v\\@<!'" end="'"
     syn region tcshDQuote	keepend contained start='\v\\@<!"' end='"' contains=@tcshVarList,tcshSpecial,@Spell
     syn region tcshBQuote	keepend start='\v\\@<!`' end='`' contains=@tcshStatements
@@ -149,7 +151,7 @@
     syn region tcshBQuote	keepend matchgroup=tcshBQuoteGrp start='\v\\@<!`' skip='\v\\\\|\\`' end='`' contains=@tcshStatements
 endif
 
-" ----- Variables -----
+" ----- Variables ----- {{{1
 " Variable Errors. Must come first! \$ constructs will be flagged by
 " tcshSpecial, so we don't consider them here.
 syn match tcshVarError	'\v\$\S*'	contained
@@ -171,7 +173,7 @@
 syn match tcshModifierError	contained '\v:\S*'
 syn match tcshModifier		contained '\v:[ag]?[htreuls&qx]' nextgroup=@tcshModifiers
 
-" ----- Operators / Specials -----
+" ----- Operators / Specials ----- {{{1
 " Standard redirects (except <<) [<, >, >>, >>&, >>!, >>&!]
 syn match tcshRedir contained	'\v\<|\>\>?\&?!?'
 
@@ -190,13 +192,13 @@
 syn match tcshNumber	contained '\v<-?\d+>'
 
 " Arguments
-syn match tcshArguement	contained '\v\s@<=-(\w|-)*'
+syn match tcshArgument	contained '\v\s@<=-(\w|-)*'
 
 " Special characters. \xxx, or backslashed characters.
 "syn match tcshSpecial	contained '\v\\@<!\\(\d{3}|.)'
 syn match tcshSpecial	contained '\v\\%([0-7]{3}|.)'
 
-" ----- Synchronising -----
+" ----- Synchronising ----- {{{1
 if exists('tcsh_minlines')
     if tcsh_minlines == 'fromstart'
 	syn sync fromstart
@@ -207,6 +209,7 @@
     syn sync minlines=100	" Some completions can be quite long
 endif
 
+" ----- Highlighting ----- {{{1
 " Define highlighting of syntax groups
 hi def link tcshError		Error
 hi def link tcshBuiltin		Statement
@@ -233,17 +236,20 @@
 hi def link tcshUsrVar		Type
 hi def link tcshArgv		tcshUsrVar
 hi def link tcshSubst		tcshUsrVar
-hi def link tcshModifier	tcshArguement
+hi def link tcshModifier	tcshArgument
 hi def link tcshModifierError	tcshVarError
 hi def link tcshMeta		tcshSubst
 hi def link tcshRedir		tcshOperator
 hi def link tcshHereDoc		tcshSQuote
 hi def link tcshOperator	Operator
 hi def link tcshNumber		Number
-hi def link tcshArguement	Special
+hi def link tcshArgument	Special
 hi def link tcshSpecial		SpecialChar
+" }}}
 
 let &cpo = s:oldcpo
 unlet s:oldcpo
 
 let b:current_syntax = 'tcsh'
+
+" vim: nowrap sw=2 sts=2 ts=8 noet fdm=marker: