diff --git a/static/build.html b/static/build.html
index ac0fb112..1601c4fb 100644
--- a/static/build.html
+++ b/static/build.html
@@ -192,6 +192,9 @@
                 <a href="#build-dependencies">Build dependencies</a>
             </h2>
 
+            <p>Arch Linux, Debian buster and Ubuntu 20.04 LTS are the officially supported
+            operating systems for building GrapheneOS.</p>
+
             <p>Dependencies for fetching and verifying the sources:</p>
 
             <ul>