diff --git a/Module:-xworkspaces.md b/Module:-xworkspaces.md
index 53bb5b1..49ad277 100644
--- a/Module:-xworkspaces.md
+++ b/Module:-xworkspaces.md
@@ -1,14 +1,20 @@
 ### The module is still in development ❗️
 
 Things to be done:
-- Persistent urgent state
-- Filtering (only display workspaces with defined name/index/range)
 - Label for visible but not focused workspaces (on multiple monitors, see [`#950`](https://github.com/polybar/polybar/issues/950))
 ---
 
 This module displays EWMH desktops configured by the window manager.
 
 **NOTE**: Requires a EWMH compatible window manager.
+In particular, certain atoms need to be available on your root window (you can check this with `xprop -root <ATOM>`).
+Not all atoms are required, but functionality may be limited if some of them are not supported:
+
+* `_NET_NUMBER_OF_DESKTOPS`: Required
+* `_NET_CURRENT_DESKTOP`: `labe-active`
+* `_NET_CLIENT_LIST`: `label-urgent`, `label-occupied`, `%nwin%`
+* `_NET_DESKTOP_NAMES`: `%name%`
+* `_NET_DESKTOP_VIEWPORT`: `pin-workspaces = true`
 
 ### Basic settings
 ~~~ ini