Mention the vi key bindings in the README

README.md

@@ -3,9 +3,9 @@ sxiv: Simple (or small or suckless) X Image Viewer
 sxiv is an alternative to feh and qiv. Its only dependency besides xlib is
 imlib2. The primary goal for writing sxiv is to create an image viewer, which
 only has the most basic features required for fast image viewing (the ones I
-want). It works nicely with tiling window managers and its code base should be
-kept small and clean to make it easy for you to dig into it and customize it
-for your needs.
+want). It has vi key bindings and works nicely with tiling window managers.
+Its code base should be kept small and clean to make it easy for you to dig
+into it and customize it for your needs.
 
 Installation
 ------------