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diff --git a/src/lib/Xmobar/Plugins/Monitors/Swap.hs b/src/lib/Xmobar/Plugins/Monitors/Swap.hs
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+++ b/src/lib/Xmobar/Plugins/Monitors/Swap.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.Swap
+-- Copyright   :  (c) Andrea Rossato
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A  swap usage monitor for Xmobar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.Swap where
+
+import Xmobar.Plugins.Monitors.Common
+
+import qualified Data.ByteString.Lazy.Char8 as B
+
+swapConfig :: IO MConfig
+swapConfig = mkMConfig
+        "Swap: <usedratio>%"                    -- template
+        ["usedratio", "total", "used", "free"] -- available replacements
+
+fileMEM :: IO B.ByteString
+fileMEM = B.readFile "/proc/meminfo"
+
+parseMEM :: IO [Float]
+parseMEM =
+    do file <- fileMEM
+       let li i l
+               | l /= [] = head l !! i
+               | otherwise = B.empty
+           fs s l
+               | null l    = False
+               | otherwise = head l == B.pack s
+           get_data s = flip (/) 1024 . read . B.unpack . li 1 . filter (fs s)
+           st   = map B.words . B.lines $ file
+           tot  = get_data "SwapTotal:" st
+           free = get_data "SwapFree:" st
+       return [(tot - free) / tot, tot, tot - free, free]
+
+formatSwap :: [Float] -> Monitor [String]
+formatSwap (r:xs) = do
+  d <- getConfigValue decDigits
+  other <- mapM (showWithColors (showDigits d)) xs
+  ratio <- showPercentWithColors r
+  return $ ratio:other
+formatSwap _ = return $ replicate 4 "N/A"
+
+runSwap :: [String] -> Monitor String
+runSwap _ =
+    do m <- io parseMEM
+       l <- formatSwap m
+       parseTemplate l