diff --git a/README.md b/README.md
index fe462597357..e7255e75ca4 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@ or queried through the `xbps-install(1)` and `xbps-query(1)` utilities, respecti
 into a `masterdir` that is used as its main `chroot` directory. `xbps-src` supports
 multiple utilities to accomplish this task:
 
+ - `bwrap` - bubblewrap, see https://github.com/projectatomic/bubblewrap.
+ - `ethereal` - only useful for one-shot containers, i.e docker (used with travis).
  - `xbps-uunshare(1)` - XBPS utility that uses `user_namespaces(7)` (part of xbps, default).
  - `xbps-uchroot(1)` - XBPS utility that uses `namespaces` and must be `setgid` (part of xbps).
  - `proot(1)` - utility that implements chroot/bind mounts in user space, see https://proot-me.github.io/.