diff --git a/about/authors/developers.en.tm b/about/authors/developers.en.tm
index 4f71610..3a750a0 100644
--- a/about/authors/developers.en.tm
+++ b/about/authors/developers.en.tm
@@ -1,6 +1,6 @@
-<TeXmacs|1.99.9>
+<TeXmacs|1.99.19>
 
-<style|<tuple|tmdoc|english|old-spacing>>
+<style|<tuple|tmdoc|english|old-spacing|old-dots|old-lengths>>
 
 <\body>
   <tmdoc-title|Developers of <TeXmacs>>
@@ -97,6 +97,8 @@
     <item>Nelson Beebe helped with manifacturing a more robust
     <verbatim|configure.in>.
 
+    <item>Jeroen Wouters contributed several patches.
+
     <item>Kai Krüger fixed several details for the new <name|Maple>
     interface.
 
@@ -123,7 +125,7 @@
     acknowledging some initial inspiration from both <TeX> and <name|Emacs>.
   </itemize>
 
-  <tmdoc-copyright|1998--2019|Joris van der Hoeven>
+  <tmdoc-copyright|1998\U2019|Joris van der Hoeven>
 
   <tmdoc-license|Permission is granted to copy, distribute and/or modify this
   document under the terms of the GNU Free Documentation License, Version 1.1