diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,8 @@
+## 3.1.1
+
+* More time-ordered logging functions
+  [#199](https://github.com/kazu-yamamoto/logger/pull/199
+
 ## 3.1.0
 
 * Having a single Buffer in LoggerSet for locking [#197](https://github.com/kazu-yamamoto/logger/pull/197.
diff --git a/System/Log/FastLogger.hs b/System/Log/FastLogger.hs
--- a/System/Log/FastLogger.hs
+++ b/System/Log/FastLogger.hs
@@ -101,17 +101,24 @@
 -- This type signature should be read as:
 --
 -- > newFastLogger :: LogType -> IO (FastLogger, IO ())
+--
+-- This logger uses `numCapabilities` many buffers, and thus
+-- does not provide time-ordered output.
+-- For time-ordered output, use `newFastLogger1`.
 newFastLogger :: LogType' v -> IO (v -> IO (), IO ())
 newFastLogger typ = newFastLoggerCore Nothing typ
 
+-- | Like `newFastLogger`, but creating a logger that uses only 1
+-- capability. This scales less well on multi-core machines,
+-- but provides time-ordered output.
 newFastLogger1 :: LogType' v -> IO (v -> IO (), IO ())
 newFastLogger1 typ = newFastLoggerCore (Just 1) typ
 
 newFastLoggerCore :: Maybe Int -> LogType' v -> IO (v -> IO (), IO ())
 newFastLoggerCore mn typ = case typ of
     LogNone                        -> return (const noOp, noOp)
-    LogStdout bsize                -> newStdoutLoggerSet bsize >>= stdLoggerInit
-    LogStderr bsize                -> newStderrLoggerSet bsize >>= stdLoggerInit
+    LogStdout bsize                -> newStdoutLoggerSetN bsize mn >>= stdLoggerInit
+    LogStderr bsize                -> newStderrLoggerSetN bsize mn >>= stdLoggerInit
     LogFileNoRotate fp bsize       -> newFileLoggerSetN bsize mn fp >>= fileLoggerInit
     LogFile fspec bsize            -> rotateLoggerInit fspec bsize
     LogFileTimedRotate fspec bsize -> timedRotateLoggerInit fspec bsize
diff --git a/System/Log/FastLogger/LoggerSet.hs b/System/Log/FastLogger/LoggerSet.hs
--- a/System/Log/FastLogger/LoggerSet.hs
+++ b/System/Log/FastLogger/LoggerSet.hs
@@ -6,8 +6,11 @@
   , newFileLoggerSet
   , newFileLoggerSetN
   , newStdoutLoggerSet
+  , newStdoutLoggerSetN
   , newStderrLoggerSet
+  , newStderrLoggerSetN
   , newLoggerSet
+  , newFDLoggerSet
   -- * Renewing and removing a logger set
   , renewLoggerSet
   , rmLoggerSet
@@ -42,10 +45,16 @@
                            (IO ())
 
 -- | Creating a new 'LoggerSet' using a file.
+--
+-- Uses `numCapabilties` many buffers, which will result in log
+-- output that is not ordered by time (see `newFileLoggerSetN`).
 newFileLoggerSet :: BufSize -> FilePath -> IO LoggerSet
 newFileLoggerSet size file = openFileFD file >>= newFDLoggerSet size Nothing (Just file)
 
--- | Creating a new 'LoggerSet' using a file.
+-- | Creating a new 'LoggerSet' using a file, using only the given number of capabilites.
+--
+-- Giving @mn = Just 1@ scales less well on multi-core machines,
+-- but provides time-ordered output.
 newFileLoggerSetN :: BufSize -> Maybe Int -> FilePath -> IO LoggerSet
 newFileLoggerSetN size mn file = openFileFD file >>= newFDLoggerSet size mn (Just file)
 
@@ -53,9 +62,19 @@
 newStdoutLoggerSet :: BufSize -> IO LoggerSet
 newStdoutLoggerSet size = getStdoutFD >>= newFDLoggerSet size Nothing Nothing
 
+-- | Creating a new 'LoggerSet' using stdout, with the given number of buffers
+-- (see `newFileLoggerSetN`).
+newStdoutLoggerSetN :: BufSize -> Maybe Int -> IO LoggerSet
+newStdoutLoggerSetN size mn = getStdoutFD >>= newFDLoggerSet size mn Nothing
+
 -- | Creating a new 'LoggerSet' using stderr.
 newStderrLoggerSet :: BufSize -> IO LoggerSet
 newStderrLoggerSet size = getStderrFD >>= newFDLoggerSet size Nothing Nothing
+
+-- | Creating a new 'LoggerSet' using stderr, with the given number of buffers
+-- (see `newFileLoggerSetN`).
+newStderrLoggerSetN :: BufSize -> Maybe Int -> IO LoggerSet
+newStderrLoggerSetN size mn = getStderrFD >>= newFDLoggerSet size mn Nothing
 
 {-# DEPRECATED newLoggerSet "Use newFileLoggerSet etc instead" #-}
 -- | Creating a new 'LoggerSet'.
diff --git a/fast-logger.cabal b/fast-logger.cabal
--- a/fast-logger.cabal
+++ b/fast-logger.cabal
@@ -1,5 +1,5 @@
 Name:                   fast-logger
-Version:                3.1.0
+Version:                3.1.1
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3