diff --git a/CONTRIBUTORS b/CONTRIBUTORS
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -1,11 +1,12 @@
 List of contributors to Kallithea project:
 
+    Thomas De Schampheleire <thomas.de_schampheleire@nokia.com> 2014-2020
+    Mads Kiilerich <mads@kiilerich.com> 2016-2020
     Andrej Shadura <andrew@shadura.me> 2012 2014-2017 2019
-    Thomas De Schampheleire <thomas.de_schampheleire@nokia.com> 2014-2019
     Étienne Gilli <etienne.gilli@gmail.com> 2015-2017 2019
-    Mads Kiilerich <mads@kiilerich.com> 2016-2019
     Allan Nordhøy <epost@anotheragency.no> 2017-2019
     ssantos <ssantos@web.de> 2018-2019
+    Adi Kriegisch <adi@cg.tuwien.ac.at> 2019
     Danni Randeris <danniranderis@gmail.com> 2019
     Edmund Wong <ewong@crazy-cat.org> 2019
     Elizabeth Sherrock <lizzyd710@gmail.com> 2019
@@ -15,6 +16,7 @@ List of contributors to Kallithea projec
     Mateusz Mendel <mendelm9@gmail.com> 2019
     Nathan <bonnemainsnathan@gmail.com> 2019
     Oleksandr Shtalinberg <o.shtalinberg@gmail.com> 2019
+    Private <adamantine.sword@gmail.com> 2019
     THANOS SIOURDAKIS <siourdakisthanos@gmail.com> 2019
     Wolfgang Scherer <wolfgang.scherer@gmx.de> 2019
     Христо Станев <hstanev@gmail.com> 2019
diff --git a/docs/conf.py b/docs/conf.py
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -47,7 +47,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = u'Kallithea'
-copyright = u'2010-2019 by various authors, licensed as GPLv3.'
+copyright = u'2010-2020 by various authors, licensed as GPLv3.'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
diff --git a/kallithea/templates/about.html b/kallithea/templates/about.html
--- a/kallithea/templates/about.html
+++ b/kallithea/templates/about.html
@@ -24,12 +24,13 @@
   necessarily limited to the following:</p>
   <ul>
 
-  <li>Copyright &copy; 2012&ndash;2019, Mads Kiilerich</li>
+  <li>Copyright &copy; 2012&ndash;2020, Mads Kiilerich</li>
+  <li>Copyright &copy; 2014&ndash;2020, Thomas De Schampheleire</li>
   <li>Copyright &copy; 2012, 2014&ndash;2017, 2019, Andrej Shadura</li>
-  <li>Copyright &copy; 2014&ndash;2019, Thomas De Schampheleire</li>
   <li>Copyright &copy; 2015&ndash;2017, 2019, Étienne Gilli</li>
   <li>Copyright &copy; 2017&ndash;2019, Allan Nordhøy</li>
   <li>Copyright &copy; 2018&ndash;2019, ssantos</li>
+  <li>Copyright &copy; 2019, Adi Kriegisch</li>
   <li>Copyright &copy; 2019, Danni Randeris</li>
   <li>Copyright &copy; 2019, Edmund Wong</li>
   <li>Copyright &copy; 2019, Elizabeth Sherrock</li>
@@ -39,6 +40,7 @@
   <li>Copyright &copy; 2019, Mateusz Mendel</li>
   <li>Copyright &copy; 2019, Nathan</li>
   <li>Copyright &copy; 2019, Oleksandr Shtalinberg</li>
+  <li>Copyright &copy; 2019, Private</li>
   <li>Copyright &copy; 2019, THANOS SIOURDAKIS</li>
   <li>Copyright &copy; 2019, Wolfgang Scherer</li>
   <li>Copyright &copy; 2019, Христо Станев</li>
diff --git a/kallithea/templates/base/base.html b/kallithea/templates/base/base.html
--- a/kallithea/templates/base/base.html
+++ b/kallithea/templates/base/base.html
@@ -23,7 +23,7 @@
             <a class="navbar-link" href="${h.url('kallithea_project_url')}" target="_blank">Kallithea</a>,
         %endif
         which is
-        <a class="navbar-link" href="${h.canonical_url('about')}#copyright">&copy; 2010&ndash;2019 by various authors &amp; licensed under GPLv3</a>.
+        <a class="navbar-link" href="${h.canonical_url('about')}#copyright">&copy; 2010&ndash;2020 by various authors &amp; licensed under GPLv3</a>.
         %if c.issues_url:
             &ndash; <a class="navbar-link" href="${c.issues_url}" target="_blank">${_('Support')}</a>
         %endif