diff --git a/doc.go b/doc.go
new file mode 100644
index 0000000..5530084
--- /dev/null
+++ b/doc.go
@@ -0,0 +1,32 @@
+// Package to set window hints like progress in taskbar on Linux.
+//
+// You can enable progress bar, set an urgent state to an application ("pulse")
+// or add a counter badge in taskbar.
+// Take a note that you should not make your application rely on these features,
+// as whether they will work depends on users desktop environments.
+//
+// The package uses libunity Launcher API
+// (https://wiki.ubuntu.com/Unity/LauncherAPI) by default, which is supported in
+// KDE and in GNOME with extensions like Dash-to-Dock. On Cinnamon it uses Xorg
+// hints, the same that are used in libxapp (https://github.com/linuxmint/xapp).
+// Neither libunity nor libxapp don't need to be installed for this package to
+// work, direct Dbus calls and Xorg hints are used instead.
+//
+// There are 2 environment variables to enforce specific behaviour for this
+// library:
+//
+//   - GO_TASKBAR_BACKEND chooses specific backend no matter what should be
+//     selected automatically by code. Only useful for testing.
+//     Possible values: libunity, xapp
+//   - GO_TASKBAR_DESKTOP_NAME overwrites desktop file name passed to the library
+//     for libunity backend to work. This can be useful for packagers (especially
+//     for snaps, because desktop file names are changed there automaticaly)
+//     without the need to patch a program.
+//
+// A note for KDE users: while Plasma supports libunity Launcher API, you may
+// notice lack of counter badges when developing software. This is caused by
+// Plasma behaviour, that expects a counter badge to only be shown by an
+// application that also shows notifications. If you application shows them,
+// has a proper desktop file and showing badges is allowed in plasma settings,
+// counter badge will work as it should.
+package taskbar
diff --git a/taskbar.go b/taskbar.go
index 637392e..4c5ff3b 100644
--- a/taskbar.go
+++ b/taskbar.go
@@ -1,4 +1,3 @@
-// Package to set window hints like progress in taskbar on Linux.
 package taskbar
 
 import (
@@ -33,7 +32,8 @@ type Taskbar struct {
 // Creates [Taskbar] item.
 // `desktopName` is a name of desktop file to be worked with using libunity
 // Launcher API (".desktop" suffix can be omitted). `xid` is an xorg window ID
-// used in case if taskbar item is modified using xapp window hints.
+// used in case if taskbar item is modified using xapp window hints, set it to 0
+// if not used.
 func Connect(desktopName string, xid int32) (*Taskbar, error) {
 	var t Taskbar
 	var session session