diff --git a/onelab.html b/onelab.html
index bb0954fd7769e7d2ff3a4016ccc39e53e34ffa99..ad43366e2eeb0cc2afefa5a0d7ccad683a6a3f0b 100644
--- a/onelab.html
+++ b/onelab.html
@@ -11,6 +11,9 @@
 <meta name="apple-itunes-app" content="app-id=845930897">
 <link href="onelab.css" rel="stylesheet" type="text/css">
 <link href="favicon.ico" rel="shortcut icon" type="image/x-icon">
+<style type="text/css"><!--
+  div.small { font-size:80%; }
+--></style>
 
 </head>
 
@@ -59,7 +62,7 @@ or not) can be easily interfaced as well.
   <ul>
     <li>Desktop version for <a href="files/onelab-Windows64.zip">Windows</a>,
       <a href="files/onelab-Linux64.zip">Linux</a> or
-      <a href="files/onelab-MacOSX.dmg">macOS</a>
+      <a href="files/onelab-MacOSX.dmg">macOS</a> <a href="#1"><sup>*</sup></a>
     <li>Mobile version for <a href="https://play.google.com/store/apps/details?id=org.geuz.onelab">Android</a> and
       <a href="https://itunes.apple.com/us/app/onelab/id845930897">iOS</a>
     <li><a href="files/onelab-source.zip">Source code</a>
@@ -79,6 +82,11 @@ or not) can be easily interfaced as well.
     <a href="https://gitlab.onelab.info/doc/tutorials/wikis">the tutorials</a>
 </ol>
 
+<div class="small">
+  <a name="1"><sup>*</sup></a> Desktop versions require Windows 10, Linux with
+  glibc >= 2.24, or macOS >= 10.15
+</div>
+
 <h2>Additional information</h2>
 
 <p>