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diff --git a/src/Plugins/Monitors/Mem.hs b/src/Plugins/Monitors/Mem.hs
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+++ b/src/Plugins/Monitors/Mem.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.Mem
+-- Copyright   :  (c) Andrea Rossato
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A memory monitor for Xmobar
+--
+-----------------------------------------------------------------------------
+
+module Plugins.Monitors.Mem (memConfig, runMem, totalMem, usedMem) where
+
+import Plugins.Monitors.Common
+
+memConfig :: IO MConfig
+memConfig = mkMConfig
+       "Mem: <usedratio>% (<cache>M)" -- template
+       ["usedbar", "freebar", "usedratio", "total",
+        "free", "buffer", "cache", "rest", "used"]  -- available replacements
+
+fileMEM :: IO String
+fileMEM = readFile "/proc/meminfo"
+
+parseMEM :: IO [Float]
+parseMEM =
+    do file <- fileMEM
+       let content = map words $ take 4 $ lines file
+           [total, free, buffer, cache] = map (\line -> (read $ line !! 1 :: Float) / 1024) content
+           rest = free + buffer + cache
+           used = total - rest
+           usedratio = used / total
+       return [usedratio, total, free, buffer, cache, rest, used]
+
+totalMem :: IO Float
+totalMem = fmap ((*1024) . (!!1)) parseMEM
+
+usedMem :: IO Float
+usedMem = fmap ((*1024) . (!!6)) parseMEM
+
+formatMem :: [Float] -> Monitor [String]
+formatMem (r:xs) =
+    do let f = showDigits 0
+           rr = 100 * r
+       ub <- showPercentBar rr r
+       fb <- showPercentBar (100 - rr) (1 - r)
+       rs <- showPercentWithColors r
+       s <- mapM (showWithColors f) xs
+       return (ub:fb:rs:s)
+formatMem _ = return $ replicate 9 "N/A"
+
+runMem :: [String] -> Monitor String
+runMem _ =
+    do m <- io parseMEM
+       l <- formatMem m
+       parseTemplate l