diff --git a/runtime/syntax/aspperl.vim b/runtime/syntax/aspperl.vim
index 5a9abedb19..9f766364a1 100644
--- a/runtime/syntax/aspperl.vim
+++ b/runtime/syntax/aspperl.vim
@@ -1,6 +1,6 @@
 " Vim syntax file
 " Language:	Active State's PerlScript (ASP)
-" Maintainer:	Aaron Hope <edh@brioforge.com>
+" Maintainer:	Aaron Hope <edh@brioforge.com> (invalid)
 " URL:		http://nim.dhs.org/~edh/aspperl.vim
 " Last Change:	2001 May 09
 
diff --git a/runtime/syntax/pilrc.vim b/runtime/syntax/pilrc.vim
index f0e5f9bbc7..409be5d21e 100644
--- a/runtime/syntax/pilrc.vim
+++ b/runtime/syntax/pilrc.vim
@@ -1,6 +1,6 @@
 " Vim syntax file
 " Language:	pilrc - a resource compiler for Palm OS development
-" Maintainer:	Brian Schau <brian@schau.com>
+" Maintainer:	Brian Schau <brian@schau.com> (invalid)
 " Last change:	2003 May 11
 " Available on:	http://www.schau.com/pilrcvim/pilrc.vim
 
diff --git a/runtime/syntax/rrst.vim b/runtime/syntax/rrst.vim
index 3a56342cd8..7de6b0be72 100644
--- a/runtime/syntax/rrst.vim
+++ b/runtime/syntax/rrst.vim
@@ -1,6 +1,6 @@
 " reStructured Text with R statements
 " Language: reST with R code chunks
-" Maintainer: Alex Zvoleff, azvoleff@mail.sdsu.edu
+" Maintainer: Alex Zvoleff, azvoleff@mail.sdsu.edu (invalid)
 " Homepage: https://github.com/jalvesaq/R-Vim-runtime
 " Last Change: Thu Apr 05, 2018  11:06PM
 "
diff --git a/runtime/syntax/rust.vim b/runtime/syntax/rust.vim
index 55d3f14dc2..d5af6d7fb3 100644
--- a/runtime/syntax/rust.vim
+++ b/runtime/syntax/rust.vim
@@ -1,6 +1,6 @@
 " Vim syntax file
 " Language:     Rust
-" Maintainer:   Patrick Walton <pcwalton@mozilla.com>
+" Maintainer:   Patrick Walton <pcwalton@mozilla.com> (invalid)
 " Maintainer:   Ben Blum <bblum@cs.cmu.edu>
 " Maintainer:   Chris Morgan <me@chrismorgan.info>
 " Last Change:  2023-09-11
diff --git a/runtime/syntax/tli.vim b/runtime/syntax/tli.vim
index b96d4a2119..917522b8bc 100644
--- a/runtime/syntax/tli.vim
+++ b/runtime/syntax/tli.vim
@@ -1,6 +1,6 @@
 " Vim syntax file
 " Language:	TealInfo source files (*.tli)
-" Maintainer:	Kurt W. Andrews <kandrews@fastrans.net>
+" Maintainer:	Kurt W. Andrews <kandrews@fastrans.net> (invalid)
 " Last Change:	2001 May 10
 " Version:      1.0