diff --git a/runtime/ftplugin/chicken.vim b/runtime/ftplugin/chicken.vim
index 84d45ba..b12b264 100644
--- a/runtime/ftplugin/chicken.vim
+++ b/runtime/ftplugin/chicken.vim
@@ -1,12 +1,12 @@
 " CHICKEN-specific Vim customizations
-" Last Change: 2018-03-05
-" Author: Evan Hanson <evhan@foldling.org>
-" Maintainer: Evan Hanson <evhan@foldling.org>
-" Repository: https://git.foldling.org/vim-scheme.git
-" URL: https://foldling.org/vim/ftplugin/chicken.vim
-" Notes: These are supplemental settings, to be loaded after the core
-" Scheme ftplugin file (ftplugin/scheme.vim). Enable it by setting
-" b:is_chicken=1 and filetype=scheme.
+" Last Change: 2024 Jun 21
+" Author:      Evan Hanson <evhan@foldling.org>
+" Maintainer:  Evan Hanson <evhan@foldling.org>
+" Repository:  https://git.foldling.org/vim-scheme.git
+" URL:         https://foldling.org/vim/ftplugin/chicken.vim
+" Notes:       These are supplemental settings, to be loaded after the
+"              core Scheme ftplugin file (ftplugin/scheme.vim). Enable
+"              it by setting b:is_chicken=1 and filetype=scheme.
 
 if !exists('b:did_scheme_ftplugin')
   finish
diff --git a/runtime/ftplugin/scheme.vim b/runtime/ftplugin/scheme.vim
index 03f625b..63e5781 100644
--- a/runtime/ftplugin/scheme.vim
+++ b/runtime/ftplugin/scheme.vim
@@ -1,12 +1,12 @@
 " Vim filetype plugin file
-" Language:	Scheme (R7RS)
-" Last Change:	2019 Nov 19
-"		2024 May 23 by Riley Bruins <ribru17@gmail.com> ('commentstring')
-" Author:	Evan Hanson <evhan@foldling.org>
-" Maintainer:	Evan Hanson <evhan@foldling.org>
+" Language:            Scheme (R7RS)
+" Last Change:         2024 Jun 21
+"                      2024 May 23 by Riley Bruins <ribru17@gmail.com> ('commentstring')
+" Author:              Evan Hanson <evhan@foldling.org>
+" Maintainer:          Evan Hanson <evhan@foldling.org>
 " Previous Maintainer: Sergey Khorev <sergey.khorev@gmail.com>
-" Repository:	https://git.foldling.org/vim-scheme.git
-" URL:		https://foldling.org/vim/ftplugin/scheme.vim
+" Repository:          https://git.foldling.org/vim-scheme.git
+" URL:                 https://foldling.org/vim/ftplugin/scheme.vim
 
 if exists('b:did_ftplugin')
   finish
@@ -20,11 +20,13 @@
 setl commentstring=;\ %s
 setl define=^\\s*(def\\k*
 setl iskeyword=33,35-39,42-43,45-58,60-90,94,95,97-122,126
+setl formatoptions-=t
 
-let b:undo_ftplugin = 'setl lisp< comments< commentstring< define< iskeyword<'
+let b:undo_ftplugin = 'setl lisp< comments< commentstring< define< iskeyword< formatoptions<'
 
 setl lispwords+=case
 setl lispwords+=define
+setl lispwords+=define-library
 setl lispwords+=define-record-type
 setl lispwords+=define-syntax
 setl lispwords+=define-values
diff --git a/runtime/indent/scheme.vim b/runtime/indent/scheme.vim
index 496da32..888659b 100644
--- a/runtime/indent/scheme.vim
+++ b/runtime/indent/scheme.vim
@@ -1,9 +1,10 @@
 " Vim indent file
-" Language: Scheme
-" Last Change: 2018 Jan 31
-" Maintainer: Evan Hanson <evhan@foldling.org>
+" Language:            Scheme
+" Last Change:         2024 Jun 21
+" Maintainer:          Evan Hanson <evhan@foldling.org>
 " Previous Maintainer: Sergey Khorev <sergey.khorev@gmail.com>
-" URL: https://foldling.org/vim/indent/scheme.vim
+" Repository:          https://git.foldling.org/vim-scheme.git
+" URL:                 https://foldling.org/vim/indent/scheme.vim
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
diff --git a/runtime/syntax/chicken.vim b/runtime/syntax/chicken.vim
index f53d872..958fc1f 100644
--- a/runtime/syntax/chicken.vim
+++ b/runtime/syntax/chicken.vim
@@ -1,13 +1,13 @@
 " Vim syntax file
-" Language: Scheme (CHICKEN)
-" Last Change: 2021 Oct 01
-" Author: Evan Hanson <evhan@foldling.org>
-" Maintainer: Evan Hanson <evhan@foldling.org>
-" Repository: https://git.foldling.org/vim-scheme.git
-" URL: https://foldling.org/vim/syntax/chicken.vim
-" Notes: This is supplemental syntax, to be loaded after the core Scheme
-" syntax file (syntax/scheme.vim). Enable it by setting b:is_chicken=1
-" and filetype=scheme.
+" Language:    Scheme (CHICKEN)
+" Last Change: 2024 Jun 21
+" Author:      Evan Hanson <evhan@foldling.org>
+" Maintainer:  Evan Hanson <evhan@foldling.org>
+" Repository:  https://git.foldling.org/vim-scheme.git
+" URL:         https://foldling.org/vim/syntax/chicken.vim
+" Notes:       This is supplemental syntax, to be loaded after the core
+"              Scheme syntax file (syntax/scheme.vim). Enable it by
+"              setting b:is_chicken=1 and filetype=scheme.
 
 " Only to be used on top of the Scheme syntax.
 if !exists('b:did_scheme_syntax')
diff --git a/runtime/syntax/scheme.vim b/runtime/syntax/scheme.vim
index c4454fc..59b0cc5 100644
--- a/runtime/syntax/scheme.vim
+++ b/runtime/syntax/scheme.vim
@@ -1,12 +1,12 @@
 " Vim syntax file
-" Language: Scheme (R7RS)
-" Last Change: 2021-01-03
-" Author: Evan Hanson <evhan@foldling.org>
-" Maintainer: Evan Hanson <evhan@foldling.org>
-" Previous Author: Dirk van Deun <dirk@igwe.vub.ac.be>
+" Language:            Scheme (R7RS)
+" Last Change:         2024 Jun 21
+" Author:              Evan Hanson <evhan@foldling.org>
+" Maintainer:          Evan Hanson <evhan@foldling.org>
+" Previous Author:     Dirk van Deun <dirk@igwe.vub.ac.be>
 " Previous Maintainer: Sergey Khorev <sergey.khorev@gmail.com>
-" Repository: https://git.foldling.org/vim-scheme.git
-" URL: https://foldling.org/vim/syntax/scheme.vim
+" Repository:          https://git.foldling.org/vim-scheme.git
+" URL:                 https://foldling.org/vim/syntax/scheme.vim
 
 if exists('b:current_syntax')
   finish
@@ -50,9 +50,11 @@
 syn match schemeCharacter /#\\.[^ `'\t\n\[\]()]*/
 syn match schemeCharacter /#\\x[0-9a-fA-F]\+/
 
-syn match schemeComment /;.*$/ contains=@Spell
+syn match schemeComment /;.*$/ contains=schemeTodo,@Spell
 
-syn region schemeMultilineComment start=/#|/ end=/|#/ contains=schemeMultilineComment,@Spell
+syn region schemeMultilineComment start=/#|/ end=/|#/ contains=schemeTodo,schemeMultilineComment,@Spell
+
+syn match schemeTodo /\c\<\(todo\|xxx\|fixme\|note\):\?\>/ contained
 
 syn region schemeForm matchgroup=schemeParentheses start="(" end=")" contains=ALLBUT,schemeUnquote,schemeDatumCommentForm,@schemeImportCluster
 syn region schemeForm matchgroup=schemeParentheses start="\[" end="\]" contains=ALLBUT,schemeUnquote,schemeDatumCommentForm,@schemeImportCluster
@@ -427,6 +429,7 @@
 syn keyword schemeFunction write-u8
 syn keyword schemeFunction zero?
 
+hi def link schemeTodo Todo
 hi def link schemeBoolean Boolean
 hi def link schemeCharacter Character
 hi def link schemeComment Comment