diff --git a/runtime/indent/fennel.vim b/runtime/indent/fennel.vim
new file mode 100644
index 0000000..e12aa18
--- /dev/null
+++ b/runtime/indent/fennel.vim
@@ -0,0 +1,12 @@
+" Vim indent file
+" Language:    Fennel
+" Maintainer:  Gregory Anders <greg[NOSPAM]@gpanders.com>
+" Last Change: 2022 Apr 20
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+
+" Use the Lisp indenting
+runtime! indent/lisp.vim
diff --git a/runtime/indent/pov.vim b/runtime/indent/pov.vim
index f74c96b..60077ff 100644
--- a/runtime/indent/pov.vim
+++ b/runtime/indent/pov.vim
@@ -2,6 +2,7 @@
 " Language: PoV-Ray Scene Description Language
 " Maintainer: David Necas (Yeti) <yeti@physics.muni.cz>
 " Last Change: 2017 Jun 13
+"              2022 April: b:undo_indent added by Doug Kearns
 " URI: http://trific.ath.cx/Ftp/vim/indent/pov.vim
 
 " Only load this indent file when no other was loaded.
@@ -16,6 +17,8 @@
 setlocal indentexpr=GetPoVRayIndent()
 setlocal indentkeys+==else,=end,0]
 
+let b:undo_indent = "setl inde< indk< lisp<"
+
 " Only define the function once.
 if exists("*GetPoVRayIndent")
   finish
diff --git a/runtime/indent/tf.vim b/runtime/indent/tf.vim
index a980538..bb40bf6 100644
--- a/runtime/indent/tf.vim
+++ b/runtime/indent/tf.vim
@@ -2,7 +2,7 @@
 " Language:     tf (TinyFugue)
 " Maintainer:   Christian J. Robinson <heptite@gmail.com>
 " URL:          http://www.vim.org/scripts/script.php?script_id=174
-" Last Change:  2017 Feb 25 
+" Last Change:  2022 Apr 25
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -14,6 +14,8 @@
 setlocal indentkeys-=0{,0} indentkeys-=0# indentkeys-=:
 setlocal indentkeys+==/endif,=/then,=/else,=/done,0;
 
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
 " Only define the function once:
 if exists("*GetTFIndent")
   finish
diff --git a/runtime/indent/tilde.vim b/runtime/indent/tilde.vim
index e722a09..8658035 100644
--- a/runtime/indent/tilde.vim
+++ b/runtime/indent/tilde.vim
@@ -1,7 +1,8 @@
 "Description: Indent scheme for the tilde weblanguage
-"Author: Tobias Rundström <tobi@tobi.nu>
+"Author: Tobias Rundström <tobi@tobi.nu> (Invalid email address)
 "URL: http://tilde.tildesoftware.net
 "Last Change: May  8 09:15:09 CEST 2002
+"	      2022 April: b:undo_indent added by Doug Kearns
 
 if exists ("b:did_indent")
 	finish
@@ -13,6 +14,8 @@
 setlocal indentexpr=GetTildeIndent(v:lnum)
 setlocal indentkeys=o,O,)
 
+let b:undo_indent = "setl ai< inde< indk<"
+
 if exists("*GetTildeIndent")
 	finish
 endif
diff --git a/runtime/indent/treetop.vim b/runtime/indent/treetop.vim
index 42ec1c8..6c39c69 100644
--- a/runtime/indent/treetop.vim
+++ b/runtime/indent/treetop.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             Treetop
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2011-03-14
+" Language:		Treetop
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		2022 April 25
 
 if exists("b:did_indent")
   finish
@@ -12,6 +13,8 @@
 setlocal indentkeys=0{,0},!^F,o,O,=end
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 if exists("*GetTreetopIndent")
   finish
 endif
diff --git a/runtime/indent/xf86conf.vim b/runtime/indent/xf86conf.vim
index 5a8bc0f..834eb00 100644
--- a/runtime/indent/xf86conf.vim
+++ b/runtime/indent/xf86conf.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             XFree86 Configuration File
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2006-12-20
+" Language:		XFree86 Configuration File
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		2022 April 25
 
 if exists("b:did_indent")
   finish
@@ -12,6 +13,8 @@
 setlocal indentkeys=!^F,o,O,=End
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 if exists("*GetXF86ConfIndent")
   finish
 endif
diff --git a/runtime/indent/xinetd.vim b/runtime/indent/xinetd.vim
index 977ee3d..21000b7 100644
--- a/runtime/indent/xinetd.vim
+++ b/runtime/indent/xinetd.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             xinetd.conf(5) configuration file
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2006-12-20
+" Language:		xinetd.conf(5) configuration file
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		2022 April 25
 
 if exists("b:did_indent")
   finish
@@ -12,6 +13,8 @@
 setlocal indentkeys=0{,0},!^F,o,O
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 if exists("*GetXinetdIndent")
   finish
 endif
diff --git a/runtime/indent/yacc.vim b/runtime/indent/yacc.vim
index 01ad4fc..253ccc5 100644
--- a/runtime/indent/yacc.vim
+++ b/runtime/indent/yacc.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             YACC input file
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2006-12-20
+" Language:		YACC input file
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		2022 April 25
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -14,6 +15,8 @@
 setlocal indentkeys=!^F,o,O
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 " Only define the function once.
 if exists("*GetYaccIndent")
   finish