Explain the hooks in the Installation section.

README.rst

@@ -19,6 +19,11 @@ Installation
 
 Install the ``pacwall-git`` `AUR package`_.
 
+``pacwall`` doesn't know how to set a wallpaper by itself. You should provide it
+with some shell commands that do it. Such commands are called *hook*. There are
+some example hooks for different setups, one of which you should copy to your local
+config.
+
 If you use GNOME, run:
 
 .. code-block:: bash
@@ -42,6 +47,11 @@ If you use Sway, run:
     mkdir -p ~/.config/pacwall
     cp /usr/share/pacwall/examples/hook/swaymsg ~/.config/pacwall/pacwall.conf
 
+For some setups, such as XFCE, there are no example hooks. Furthermore, the example
+hooks can have bugs. In any case, you can always verify that ``pacwall`` itself is
+working fine by examining the image that it has generated at
+``~/.cache/pacwall/pacwall.png``.
+
 -----
 Usage
 -----
@@ -91,8 +101,6 @@ CLI
 
 * ``-k``: do not run the hook
 
-  See `List of settings`_ for details about what the hook is.
-
 -------------
 Customization
 -------------
@@ -135,10 +143,6 @@ List of settings
   hook is expected to set the wallpaper. The path to the graph image is exported
   in the ``$W`` environmental variable.
 
-  ``/usr/share/pacwall/examples/hook`` contains some example hooks for different
-  setups, one of which you have copied to ``pacwall.conf`` in the Installation_
-  section.
-
 * ``shell`` (default: ``bash``)
 
   The shell in which the commands specified in ``hook`` ought to be executed.