diff --git a/static/build.html b/static/build.html
index 68a99308..c904c2a2 100644
--- a/static/build.html
+++ b/static/build.html
@@ -278,6 +278,10 @@ cd ../..</pre>
 
             <h2>Generating signed factory images and full update packages</h2>
 
+            <p>Build the tool needed to generate A/B updates:</p>
+
+            <pre>make -j20 brillo_update_payload</pre>
+
             <p>Generate a signed release build with the release.sh script:</p>
 
             <pre>script/release.sh crosshatch</pre>