diff --git a/Language/Haskell/GhcMod/Browse.hs b/Language/Haskell/GhcMod/Browse.hs
index 11da849..c5b25dc 100644
--- a/Language/Haskell/GhcMod/Browse.hs
+++ b/Language/Haskell/GhcMod/Browse.hs
@@ -19,6 +19,7 @@ import Var
 
 -- | Getting functions, classes, etc from a module.
 --   If 'detailed' is 'True', their types are also obtained.
+--   If 'operators' is 'True', operators are also returned.
 browseModule :: Options
              -> ModuleString -- ^ A module name. (e.g. \"Data.List\")
              -> IO String
@@ -38,6 +39,7 @@ browseModule opt mdlName = convert opt . format <$> withGHCDummyFile (browse opt
 
 -- | Getting functions, classes, etc from a module.
 --   If 'detailed' is 'True', their types are also obtained.
+--   If 'operators' is 'True', operators are also returned.
 browse :: Options
        -> ModuleString -- ^ A module name. (e.g. \"Data.List\")
        -> Ghc [String]
diff --git a/Language/Haskell/GhcMod/Check.hs b/Language/Haskell/GhcMod/Check.hs
index 57057a7..28e50eb 100644
--- a/Language/Haskell/GhcMod/Check.hs
+++ b/Language/Haskell/GhcMod/Check.hs
@@ -16,7 +16,7 @@ import Prelude
 --   Warnings and errors are returned.
 checkSyntax :: Options
             -> Cradle
-            -> [FilePath]  -- ^ The target files
+            -> [FilePath]  -- ^ The target files.
             -> IO String
 checkSyntax _   _      []    = error "ghc-mod: checkSyntax: No files given"
 checkSyntax opt cradle files = unlines <$> withGHC sessionName (check opt cradle files)
@@ -31,7 +31,7 @@ checkSyntax opt cradle files = unlines <$> withGHC sessionName (check opt cradle
 --   Warnings and errors are returned.
 check :: Options
       -> Cradle
-      -> [FilePath]  -- ^ The target files
+      -> [FilePath]  -- ^ The target files.
       -> Ghc [String]
 check _   _      []        = error "ghc-mod: check: No files given"
 check opt cradle fileNames = checkIt `gcatch` handleErrMsg ls
diff --git a/Language/Haskell/GhcMod/Cradle.hs b/Language/Haskell/GhcMod/Cradle.hs
index 07d6860..429885e 100644
--- a/Language/Haskell/GhcMod/Cradle.hs
+++ b/Language/Haskell/GhcMod/Cradle.hs
@@ -10,7 +10,7 @@ import System.FilePath ((</>),takeDirectory)
 
 -- | Finding 'Cradle'.
 --   An error would be thrown.
-findCradle :: Maybe FilePath -- ^ A 'FilePath' for a sandbox
+findCradle :: Maybe FilePath -- ^ A 'FilePath' for a sandbox.
            -> GHCVersion
            -> IO Cradle
 findCradle (Just sbox) strver = do
diff --git a/Language/Haskell/GhcMod/Debug.hs b/Language/Haskell/GhcMod/Debug.hs
index a560238..cd11faa 100644
--- a/Language/Haskell/GhcMod/Debug.hs
+++ b/Language/Haskell/GhcMod/Debug.hs
@@ -18,7 +18,7 @@ import Prelude
 debugInfo :: Options
           -> Cradle
           -> GHCVersion
-          -> FilePath   -- ^ A target file
+          -> FilePath   -- ^ A target file.
           -> IO String
 debugInfo opt cradle ver fileName = unlines <$> withGHC fileName (debug opt cradle ver fileName)
 
@@ -26,7 +26,7 @@ debugInfo opt cradle ver fileName = unlines <$> withGHC fileName (debug opt crad
 debug :: Options
       -> Cradle
       -> GHCVersion
-      -> FilePath     -- ^ A target file
+      -> FilePath     -- ^ A target file.
       -> Ghc [String]
 debug opt cradle ver fileName = do
     (gopts, incDir, pkgs) <-
diff --git a/Language/Haskell/GhcMod/ErrMsg.hs b/Language/Haskell/GhcMod/ErrMsg.hs
index dde3ce6..8499353 100644
--- a/Language/Haskell/GhcMod/ErrMsg.hs
+++ b/Language/Haskell/GhcMod/ErrMsg.hs
@@ -22,7 +22,7 @@ import System.FilePath (normalise)
 
 ----------------------------------------------------------------
 
--- | A means to read the log
+-- | A means to read the log.
 type LogReader = IO [String]
 
 ----------------------------------------------------------------
diff --git a/Language/Haskell/GhcMod/GHCApi.hs b/Language/Haskell/GhcMod/GHCApi.hs
index 8ef1d99..91d47c0 100644
--- a/Language/Haskell/GhcMod/GHCApi.hs
+++ b/Language/Haskell/GhcMod/GHCApi.hs
@@ -32,13 +32,13 @@ import System.IO
 ----------------------------------------------------------------
 
 -- | Converting the 'Ghc' monad to the 'IO' monad.
-withGHCDummyFile :: Alternative m => Ghc (m a) -- ^ 'Ghc' actions created by the Ghc utilities
+withGHCDummyFile :: Alternative m => Ghc (m a) -- ^ 'Ghc' actions created by the Ghc utilities.
                                   -> IO (m a)
 withGHCDummyFile = withGHC "Dummy"
 
 -- | Converting the 'Ghc' monad to the 'IO' monad.
-withGHC :: Alternative m => FilePath  -- ^ A target file displayed in an error message
-                         -> Ghc (m a) -- ^ 'Ghc' actions created by the Ghc utilities
+withGHC :: Alternative m => FilePath  -- ^ A target file displayed in an error message.
+                         -> Ghc (m a) -- ^ 'Ghc' actions created by the Ghc utilities.
                          -> IO (m a)
 withGHC file body = ghandle ignore $ runGhc (Just libdir) $ do
     dflags <- getSessionDynFlags
@@ -154,7 +154,7 @@ modifyFlagsWithOpts dflags cmdOpts =
 
 ----------------------------------------------------------------
 
--- | Set the files that GHC will load / compile
+-- | Set the files that GHC will load / compile.
 setTargetFiles :: (GhcMonad m) => [String] -> m ()
 setTargetFiles [] = error "ghc-mod: setTargetFiles: No target files given"
 setTargetFiles files = do
@@ -163,7 +163,7 @@ setTargetFiles files = do
 
 ----------------------------------------------------------------
 
--- | Return the 'DynFlags' currently in use in the GHC session
+-- | Return the 'DynFlags' currently in use in the GHC session.
 getDynamicFlags :: IO DynFlags
 getDynamicFlags = runGhc (Just libdir) getSessionDynFlags
 
diff --git a/Language/Haskell/GhcMod/Info.hs b/Language/Haskell/GhcMod/Info.hs
index 968ca09..1b7811b 100644
--- a/Language/Haskell/GhcMod/Info.hs
+++ b/Language/Haskell/GhcMod/Info.hs
@@ -42,18 +42,18 @@ data Cmd = Info | Type deriving Eq
 -- | Obtaining information of a target expression. (GHCi's info:)
 infoExpr :: Options
          -> Cradle
-         -> FilePath     -- ^ A target file
-         -> ModuleString -- ^ A module name
-         -> Expression   -- ^ A Haskell expression
+         -> FilePath     -- ^ A target file.
+         -> ModuleString -- ^ A module name.
+         -> Expression   -- ^ A Haskell expression.
          -> IO String
 infoExpr opt cradle file modstr expr = (++ "\n") <$> withGHCDummyFile (info opt cradle file modstr expr)
 
 -- | Obtaining information of a target expression. (GHCi's info:)
 info :: Options
      -> Cradle
-     -> FilePath     -- ^ A target file
-     -> ModuleString -- ^ A module name
-     -> Expression   -- ^ A Haskell expression
+     -> FilePath     -- ^ A target file.
+     -> ModuleString -- ^ A module name.
+     -> Expression   -- ^ A Haskell expression.
      -> Ghc String
 info opt cradle file modstr expr =
     inModuleContext Info opt cradle file modstr exprToInfo "Cannot show info"
@@ -83,20 +83,20 @@ instance HasType (LPat Id) where
 -- | Obtaining type of a target expression. (GHCi's type:)
 typeExpr :: Options
          -> Cradle
-         -> FilePath     -- ^ A target file
-         -> ModuleString -- ^ A odule name
-         -> Int          -- ^ Line number
-         -> Int          -- ^ Column number
+         -> FilePath     -- ^ A target file.
+         -> ModuleString -- ^ A odule name.
+         -> Int          -- ^ Line number.
+         -> Int          -- ^ Column number.
          -> IO String
 typeExpr opt cradle file modstr lineNo colNo = withGHCDummyFile $ typeOf opt cradle file modstr lineNo colNo
 
 -- | Obtaining type of a target expression. (GHCi's type:)
 typeOf :: Options
        -> Cradle
-       -> FilePath     -- ^ A target file
-       -> ModuleString -- ^ A odule name
-       -> Int          -- ^ Line number
-       -> Int          -- ^ Column number
+       -> FilePath     -- ^ A target file.
+       -> ModuleString -- ^ A odule name.
+       -> Int          -- ^ Line number.
+       -> Int          -- ^ Column number.
        -> Ghc String
 typeOf opt cradle file modstr lineNo colNo =
     inModuleContext Type opt cradle file modstr exprToType errmsg
diff --git a/Language/Haskell/GhcMod/Types.hs b/Language/Haskell/GhcMod/Types.hs
index d050930..f69d562 100644
--- a/Language/Haskell/GhcMod/Types.hs
+++ b/Language/Haskell/GhcMod/Types.hs
@@ -3,15 +3,17 @@
 module Language.Haskell.GhcMod.Types where
 
 -- | Output style.
-data OutputStyle = LispStyle  -- ^ S expression style
-                 | PlainStyle -- ^ Plain textstyle
+data OutputStyle = LispStyle  -- ^ S expression style.
+                 | PlainStyle -- ^ Plain textstyle.
 
+-- | The type for line separator. Historically, a Null string is used.
 newtype LineSeparator = LineSeparator String
 
 data Options = Options {
     outputStyle   :: OutputStyle
   , hlintOpts     :: [String]
   , ghcOpts       :: [String]
+  -- | If 'True', 'browse' also returns operators.
   , operators     :: Bool
   -- | If 'True', 'browse' also returns types.
   , detailed      :: Bool
@@ -19,6 +21,7 @@ data Options = Options {
   , expandSplice  :: Bool
   -- | The sandbox directory.
   , sandbox       :: Maybe FilePath
+  -- | Line separator string.
   , lineSeparator :: LineSeparator
   }
 
@@ -74,33 +77,33 @@ addNewLine = (++ "\n")
 
 ----------------------------------------------------------------
 
--- | The environment where this library is used
+-- | The environment where this library is used.
 data Cradle = Cradle {
-  -- | The directory where this library is executed
+  -- | The directory where this library is executed.
     cradleCurrentDir  :: FilePath
-  -- | The directory where a cabal file is found
+  -- | The directory where a cabal file is found.
   , cradleCabalDir    :: Maybe FilePath
-  -- | The file name of the found cabal file
+  -- | The file name of the found cabal file.
   , cradleCabalFile   :: Maybe FilePath
-  -- | The sandbox directory (e.g. \"\/foo\/bar\/packages-\<ver\>.conf/\")
+  -- | The sandbox directory. (e.g. \"\/foo\/bar\/packages-\<ver\>.conf/\")
   , cradlePackageConf :: Maybe FilePath
   } deriving (Eq, Show)
 
 ----------------------------------------------------------------
 
--- | A single GHC option, as it would appear on the command line
+-- | A single GHC option, as it would appear on the command line.
 type GHCOption  = String
 
 type IncludeDir = FilePath
 type Package    = String
 
--- | GHC version in 'String'
+-- | GHC version in 'String'.
 type GHCVersion = String
 
--- | Haskell expression
+-- | Haskell expression.
 type Expression = String
 
--- | Module name
+-- | Module name.
 type ModuleString = String
 
 data CheckSpeed = Slow | Fast