diff --git a/sitemap.md b/sitemap.md
index 83d16ea5..abccba80 100644
--- a/sitemap.md
+++ b/sitemap.md
@@ -53,6 +53,7 @@
         * [Configure an email client](/email)
         * [Instant messaging usage](/XMPP)
         * [Applications](/apps)
+           * [Firefox Sync](/app_ffsync_en)
            * [Transmission](/app_transmission_en)
            * [Radicale](/app_radicale)