diff --git a/README.md b/README.md
index f2394a0..f7c6764 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Now, open ~/.config/awesome/rc.lua (or copy /etc/xdg/awesome/rc.lua to
  and add this line somewhere in your `rc.lua`:
 
 ```lua
-    local collision = require("collision")()
+    require("collision")()
 ```
 
 It is a very good idea to also change the default `mod4+arrow` shortcut to
@@ -89,6 +89,19 @@ This can be used:
 Of course, if the `Vim` keys are used, any other shortcut binded to them have to
 be removed from rc.lua.
 
+# Appearance
+
+Collision appearance can be changed in yout theme using the `collision`
+namespace
+
+## Focus
+
+| Variable              | Description                                           |
+| :-------------------: | ----------------------------------------------------- |
+| collision_bg_focus    | The background of the focus change arrow              |
+| collision_fg_focus    | The foregroung filling color of the arrow             |
+| collision_bg_center   | The focussed client circle background                 |
+
 # Settings
 
 ```lua
@@ -106,4 +119,4 @@ cursor position.
 
 # Notes
 
-Using the focus arrows to select empty screens only work in Awesome 3.5.7+
+Using the focus arrows to select empty screens only work in Awesome 3.5.7+
\ No newline at end of file
diff --git a/focus.lua b/focus.lua
index dd294b0..cb14659 100644
--- a/focus.lua
+++ b/focus.lua
@@ -24,7 +24,11 @@ local function init()
   col_utils.draw_round_rect(cr,0,0,75,75,10)
   cr:fill()
 
-  local bounding,arrow = img._native,col_utils.arrow(55,10,0,beautiful.bg_normal,beautiful.fg_normal)
+  local bounding,arrow = img._native,col_utils.arrow(55,10,0,
+    beautiful.collision_bg_focus or beautiful.bg_normal or "#000000",
+    beautiful.collision_fg_focus or beautiful.fg_normal or "#0000ff"
+  )
+
   wiboxes = {}
   for k,v in ipairs({"up","right","down","left","center"}) do
     wiboxes[v] = wibox({})
@@ -47,7 +51,7 @@ local function init()
       wiboxes[v].shape_bounding = bounding
     end
   end
-  wiboxes["center"]:set_bg(beautiful.bg_urgent)
+  wiboxes["center"]:set_bg(beautiful.collision_bg_center or beautiful.bg_urgent or "#ff0000")
   local img = cairo.ImageSurface(cairo.Format.ARGB32, 75,75)
   local cr = cairo.Context(img)
   col_utils.draw_round_rect(cr,0,0,75,75,75/2)