diff --git a/.config/awesome/constrain.lua b/.config/awesome/constrain.lua
new file mode 100644
index 0000000..0f6d8a4
--- /dev/null
+++ b/.config/awesome/constrain.lua
@@ -0,0 +1,105 @@
+-- init -- {{{1
+-- luacheck: globals mouse
+local mouse = mouse
+local root = client
+local naughty = require('naughty')
+
+local state = {
+    client = nil,
+    signals = {}
+}
+
+local function notify(msg, keep) -- {{{1
+    local timeout = 3
+    if keep then timeout = 0 end
+
+    naughty.notify({ text = msg, timeout = timeout })
+end
+
+local function set_bounds() -- {{{1
+    local c = state.client
+    state.x_min = c.x + 5
+    state.x_max = c.x + c.width - 5
+    state.y_min = c.y + 5
+    state.y_max = c.y + c.height - 5
+end
+
+local function reposition() -- {{{1
+    local pos = mouse.coords()
+    local new_pos = {}
+
+    if pos.x > state.x_max then
+        new_pos.x = state.x_max
+    elseif pos.x < state.x_min then
+        new_pos.x = state.x_min
+    else
+        new_pos.x = pos.x
+    end
+
+    if pos.y > state.y_max then
+        new_pos.y = state.y_max
+    elseif pos.y < state.y_min then
+        new_pos.y = state.y_min
+    else
+        new_pos.y = pos.y
+    end
+    --new_pos.x = state.x_min + (state.x_max - state.x_min) / 2
+    --new_pos.y = state.y_min + (state.y_max - state.y_min) / 2
+
+    mouse.coords(new_pos, false)
+end
+
+local function connect(signal, func) -- {{{1
+    state.client:connect_signal(signal, func)
+    state.signals[signal] = func
+end
+
+local function disconnect() -- {{{1
+    for signal, func in pairs(state.signals) do
+        state.client:disconnect_signal(signal, func)
+        state.signals[signal] = nil
+    end
+end
+
+local function release() -- {{{1
+    disconnect()
+
+    root.disconnect_signal("mouse::move", reposition)
+    root.disconnect_signal("mouse::leave", reposition)
+
+    notify("Mouse released")
+
+    state.client = nil
+end
+
+local function constrain(c) -- {{{1
+    state.client = c or mouse.current_client
+
+    if state.client == nil then return end
+
+    set_bounds()
+
+    notify("Constrainging mouse to " .. state.client.name)
+
+    root.connect_signal("mouse::move", reposition)
+    root.connect_signal("mouse::leave", reposition)
+
+    connect("mouse::move", reposition)
+    connect("mouse::leave", reposition)
+    connect("property::size", set_bounds)
+    connect("property::position", set_bounds)
+    connect("unmanage", release)
+end
+
+-- public interface -- {{{1
+return {
+    constrain = constrain,
+    release = release,
+    toggle = function(c)
+        if state.client then
+            release()
+        else
+            constrain(c)
+        end
+    end
+}
diff --git a/.config/awesome/rc.lua b/.config/awesome/rc.lua
index d11a499..f1db03e 100644
--- a/.config/awesome/rc.lua
+++ b/.config/awesome/rc.lua
@@ -22,6 +22,8 @@ local lain          = require("lain")
 local freedesktop   = require("freedesktop")
 local hotkeys_popup = require("awful.hotkeys_popup")
                       require("awful.hotkeys_popup.keys")
+local constrain = require("constrain")
+
 local mytable       = awful.util.table or gears.table -- 4.{0,1} compatibility
 
 -- }}}
@@ -597,7 +599,12 @@ clientkeys = mytable.join(
             awful.titlebar.toggle(c)
             c:raise()
         end,
-        {description = "toggle titlebar", group = "client"})
+        {description = "toggle titlebar", group = "client"}),
+    -- Toggle constrain mouse to window
+    awful.key({ modkey, "Control" }, "F10", function (c)
+            constrain.toggle(c)
+        end,
+        {description = "toggle mouse constrain", group = "client"})
 )
 
 -- Bind all key numbers to tags.