diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,12 @@
+# ChangeLog for auto-update
+
+## 0.1.4.1
+
+* [#693](https://github.com/yesodweb/wai/pull/693):
+  Improve documentation for `reaperAction` function.
+* [#732](https://github.com/yesodweb/wai/pull/732):
+  Fixed memory leak in `reaperAdd` function.
+
 ## 0.1.4
 
 * Provide updateActionModify API in AutoUpdate [#547](https://github.com/yesodweb/wai/pull/547)
diff --git a/Control/Reaper.hs b/Control/Reaper.hs
--- a/Control/Reaper.hs
+++ b/Control/Reaper.hs
@@ -5,7 +5,7 @@
 -- threads. These threads will automatically spawn and die based on the
 -- presence of a workload to process on. Example uses include:
 --
--- * Killing long-running jobs 
+-- * Killing long-running jobs
 -- * Closing unused connections in a connection pool
 -- * Pruning a cache of old items (see example below)
 --
@@ -49,8 +49,9 @@
     -- ^ The action to perform on a workload. The result of this is a
     -- \"workload modifying\" function. In the common case of using lists,
     -- the result should be a difference list that prepends the remaining
-    -- workload to the temporary workload. For help with setting up such
-    -- an action, see 'mkListAction'.
+    -- workload to the temporary workload. The temporary workload here
+    -- refers to items added to the workload while the reaper action is
+    -- running. For help with setting up such an action, see 'mkListAction'.
     --
     -- Default: do nothing with the workload, and then prepend it to the
     -- temporary workload. This is incredibly useless; you should
@@ -112,7 +113,7 @@
 
 -- | State of reaper.
 data State workload = NoReaper           -- ^ No reaper thread
-                    | Workload workload  -- ^ The current jobs
+                    | Workload !workload  -- ^ The current jobs
 
 -- | Create a reaper addition function. This function can be used to add
 -- new items to the workload. Spawning of reaper threads will be handled
@@ -153,7 +154,7 @@
       next <- atomicModifyIORef' stateRef cons
       next
   where
-    cons NoReaper      = let !wl = reaperCons item reaperEmpty
+    cons NoReaper      = let wl = reaperCons item reaperEmpty
                          in (Workload wl, spawn settings stateRef tidRef)
     cons (Workload wl) = let wl' = reaperCons item wl
                          in (Workload wl', return ())
@@ -214,16 +215,16 @@
         go front' xs
 
 -- $example1
--- In this example code, we use a 'Data.Map.Strict.Map' to cache fibonacci numbers, and a 'Reaper' to prune the cache. 
+-- In this example code, we use a 'Data.Map.Strict.Map' to cache fibonacci numbers, and a 'Reaper' to prune the cache.
 --
--- The @main@ function first creates a 'Reaper', with fields to initialize the 
+-- The @main@ function first creates a 'Reaper', with fields to initialize the
 -- cache ('reaperEmpty'), add items to it ('reaperCons'), and prune it ('reaperAction').
--- The reaper will run every two seconds ('reaperDelay'), but will stop running while 
+-- The reaper will run every two seconds ('reaperDelay'), but will stop running while
 -- 'reaperNull' is true.
 --
--- @main@ then loops infinitely ('Control.Monad.forever'). Each second it calculates the fibonacci number 
--- for a value between 30 and 34, first trying the cache ('reaperRead' and 'Data.Map.Strict.lookup'), 
--- then falling back to manually calculating it (@fib@) 
+-- @main@ then loops infinitely ('Control.Monad.forever'). Each second it calculates the fibonacci number
+-- for a value between 30 and 34, first trying the cache ('reaperRead' and 'Data.Map.Strict.lookup'),
+-- then falling back to manually calculating it (@fib@)
 -- and updating the cache with the result ('reaperAdd')
 --
 -- @clean@ simply removes items cached for more than 10 seconds.
diff --git a/auto-update.cabal b/auto-update.cabal
--- a/auto-update.cabal
+++ b/auto-update.cabal
@@ -1,5 +1,5 @@
 name:                auto-update
-version:             0.1.4
+version:             0.1.4.1
 synopsis:            Efficiently run periodic, on-demand actions
 description:         API docs and the README are available at <http://www.stackage.org/package/auto-update>.
 homepage:            https://github.com/yesodweb/wai