diff --git a/documentation/liblouis.html b/documentation/liblouis.html
index 7c736a6..af59176 100644
--- a/documentation/liblouis.html
+++ b/documentation/liblouis.html
@@ -11,13 +11,13 @@
 <p>Copyright &copy; 1999-2006 by the BRLTTY Team.
 </p>
 <p>Copyright &copy; 2004-2007 ViewPlus Technologies, Inc.
-<a class="uref" href="www.viewplus.com">www.viewplus.com</a>.
+<a class="uref" href="https://www.viewplus.com">www.viewplus.com</a>.
 </p>
 <p>Copyright &copy; 2007, 2009 Abilitiessoft, Inc.
-<a class="uref" href="www.abilitiessoft.org">www.abilitiessoft.org</a>.
+<a class="uref" href="https://www.abilitiessoft.org">www.abilitiessoft.org</a>.
 </p>
 <p>Copyright &copy; 2014, 2016 Swiss Library for the Blind, Visually
-Impaired and Print Disabled. <a class="uref" href="www.sbs.ch">www.sbs.ch</a>.
+Impaired and Print Disabled. <a class="uref" href="https://www.sbs.ch">www.sbs.ch</a>.
 </p>
 
 <blockquote class="quotation">
diff --git a/documentation/liblouisutdml.html b/documentation/liblouisutdml.html
index 81916e8..2daa6f5 100644
--- a/documentation/liblouisutdml.html
+++ b/documentation/liblouisutdml.html
@@ -13,8 +13,8 @@
 <acronym>BRLTTY</acronym> Team.
 </p>
 <p>Copyright &copy; 2004-2009 ViewPlus Technologies, Inc.
-<a href="www.viewplus.com">www.viewplus.com</a> and Copyright &copy; 2006,2009
-Abilitiessoft, Inc. <a href="www.abilitiessoft.org">www.abilitiessoft.org</a>.
+<a href="https://www.viewplus.com">www.viewplus.com</a> and Copyright &copy; 2006,2009
+Abilitiessoft, Inc. <a href="https://www.abilitiessoft.org">www.abilitiessoft.org</a>.
 </p>
 <blockquote>
 <p>This file is free software; you can redistribute it and/or modify it
@@ -320,7 +320,7 @@ <h2 class="contents-heading">Table of Contents</h2>
 transcribed. The file may be either an xml file or a text file. The
 <samp>-b</samp>, <samp>-r</samp> and <samp>-p</samp> options discussed above
 provide for other types of files and processing. Typical xml files are
-those provided by <a href="www.bookshare.org">www.bookshare.org</a> or those derived from a
+those provided by <a href="https://www.bookshare.org">www.bookshare.org</a> or those derived from a
 word processor by saving in xml format. If a text file is used,
 paragraphs and headings should be separated by blank lines. In such a
 file there is no way to distinguish between paragraphs and headings,
@@ -3145,10 +3145,10 @@ <h4 class="subsubsection">5.7.6.5 output.txt</h4>
 by the BRLTTY Team.
 </p>
 <p>Copyright &copy; 2004-2009 ViewPlus Technologies, Inc.
-<a href="www.viewplus.com">www.viewplus.com</a>.
+<a href="https://www.viewplus.com">www.viewplus.com</a>.
 </p>
 <p>Copyright &copy; 2006,2009 Abilitiessoft, Inc.
-<a href="www.abilitiessoft.org">www.abilitiessoft.org</a>.
+<a href="https://www.abilitiessoft.org">www.abilitiessoft.org</a>.
 </p>
 <p>Liblouisutdml is free software: you can redistribute it and/or modify it
 under the terms of the GNU Lesser General Public License as published
@@ -3210,7 +3210,7 @@ <h4 class="subsubsection">5.7.6.5 output.txt</h4>
 graphics capability of the Tiger tactile graphics embossers.
 </p>
 <p>The latest versions of liblouisutdml and liblouis can be downloaded
-from <a href="www.liblouis.io">www.liblouis.io</a>. This site also contains links to a
+from <a href="https://www.liblouis.io">www.liblouis.io</a>. This site also contains links to a
 mailing list and to project pages on github.com. Note that
 liblouisutdml will only work with the latest version of liblouis.
 </p>