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diff --git a/src/backends/mod.rs b/src/backends/mod.rs
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+// Copyright (C) 2019 Robin Krahl <robin.krahl@ireas.org>
+// SPDX-License-Identifier: MIT
+
+mod dialog;
+
+pub use crate::backends::dialog::Dialog;
+
+use std::io::Result;
+
+/// A dialog backend.
+///
+/// A dialog backend is a program that can be used to display dialog boxes.  Use the
+/// [`default_backend`][] function to create a new instance of the default backend, or choose a
+/// backend and create an instance manually.  To use a backend, pass it to the [`show_with`][]
+/// method of a dialog box.
+///
+/// [`default_backend`]: ../function.default_backend.html
+/// [`show_with`]: ../trait.DialogBox.html#method.show_with
+pub trait Backend {
+    /// Shows the given message dialog.
+    fn show_message(&self, message: &super::Message) -> Result<()>;
+}