diff --git a/Language/Haskell/GhcMod.hs b/Language/Haskell/GhcMod.hs
index 01c0e04..f1bb0f2 100644
--- a/Language/Haskell/GhcMod.hs
+++ b/Language/Haskell/GhcMod.hs
@@ -13,6 +13,8 @@ module Language.Haskell.GhcMod (
   , ModuleString
   , Expression
   , GhcPkgDb
+  , Symbol
+  , SymbolDb
   -- * 'GhcMod' utilities
   , boot
   , browse
@@ -21,6 +23,7 @@ module Language.Haskell.GhcMod (
   , debugInfo
   , expandTemplate
   , findSymbol
+  , dumpSymbol
   , info
   , lint
   , pkgDoc
@@ -31,6 +34,9 @@ module Language.Haskell.GhcMod (
   , modules
   , languages
   , flags
+  -- * SymbolDb
+  , loadSymbolDb
+  , lookupSymbol
   ) where
 
 import Language.Haskell.GhcMod.Boot
diff --git a/Language/Haskell/GhcMod/Find.hs b/Language/Haskell/GhcMod/Find.hs
index f08ac77..e8ef11b 100644
--- a/Language/Haskell/GhcMod/Find.hs
+++ b/Language/Haskell/GhcMod/Find.hs
@@ -3,7 +3,7 @@
 module Language.Haskell.GhcMod.Find (
     Symbol
   , SymbolDb
-  , getSymbolDb
+  , loadSymbolDb
   , lookupSymbol
   , dumpSymbol
   , findSymbol
@@ -44,10 +44,10 @@ import qualified Data.Map as M
 
 ----------------------------------------------------------------
 
--- | Type of key for `SymbolDb`.
+-- | Type of function and operation names.
 type Symbol = String
 type Db = Map Symbol [ModuleString]
--- | Database from 'Symbol' to modules.
+-- | Database from 'Symbol' to \['ModuleString'\].
 newtype SymbolDb = SymbolDb Db
 
 ----------------------------------------------------------------
@@ -65,23 +65,24 @@ packageConfDir = "package.conf.d"
 
 -- | Finding modules to which the symbol belong.
 findSymbol :: IOish m => Symbol -> GhcModT m String
-findSymbol sym = convert' =<< lookupSymbol' sym <$> liftIO getSymbolDb
+findSymbol sym = convert' =<< lookupSymbol' sym <$> liftIO loadSymbolDb
 
 lookupSymbol' :: Symbol -> SymbolDb -> [ModuleString]
 lookupSymbol' sym (SymbolDb db) = fromMaybe [] (M.lookup sym db)
 
--- | Looking up 'SymbolDb' with 'Symbol' to find modules.
+-- | Looking up 'SymbolDb' with 'Symbol' to \['ModuleString'\]
+--   which will be concatenated.
 lookupSymbol :: Options -> Symbol -> SymbolDb -> String
 lookupSymbol opt sym db = convert opt $ lookupSymbol' sym db
 
 ---------------------------------------------------------------
 
--- | Creating 'SymbolDb'.
-getSymbolDb :: IO SymbolDb
-getSymbolDb = SymbolDb <$> loadSymbolDb
+-- | Loading a file and creates 'SymbolDb'.
+loadSymbolDb :: IO SymbolDb
+loadSymbolDb = SymbolDb <$> readSymbolDb
 
-loadSymbolDb :: IO Db
-loadSymbolDb = handle (\(SomeException _) -> return M.empty) $ do
+readSymbolDb :: IO Db
+readSymbolDb = handle (\(SomeException _) -> return M.empty) $ do
     file <- chop <$> readProcess "ghc-mod" ["dumpsym"] []
     M.fromAscList . map conv . lines <$> readFile file
   where
@@ -101,6 +102,9 @@ getPath = do
         []  -> return Nothing
         u:_ -> liftIO $ resolvePackageDb df u
 
+-- | Dumping a set of ('Symbol',\['ModuleString'\]) to a file
+--   if the file does not exist or is invalid.
+--   The file name is printed.
 dumpSymbol :: IOish m => GhcModT m String
 dumpSymbol = do
     mdir <- getPath
diff --git a/Language/Haskell/GhcMod/Ghc.hs b/Language/Haskell/GhcMod/Ghc.hs
deleted file mode 100644
index ce9b3e2..0000000
--- a/Language/Haskell/GhcMod/Ghc.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Language.Haskell.GhcMod.Ghc (
-    -- * 'SymMdlDb'
-    module Language.Haskell.GhcMod.Find
-  ) where
-
-import Language.Haskell.GhcMod.Find
diff --git a/ghc-mod.cabal b/ghc-mod.cabal
index 9a23d1e..7587bb9 100644
--- a/ghc-mod.cabal
+++ b/ghc-mod.cabal
@@ -53,7 +53,6 @@ Library
   GHC-Options:          -Wall
   Default-Extensions:   ConstraintKinds, FlexibleContexts
   Exposed-Modules:      Language.Haskell.GhcMod
-                        Language.Haskell.GhcMod.Ghc
                         Language.Haskell.GhcMod.Monad
                         Language.Haskell.GhcMod.Internal
   Other-Modules:        Language.Haskell.GhcMod.Boot
diff --git a/src/GHCMod.hs b/src/GHCMod.hs
index 561aa86..9018157 100644
--- a/src/GHCMod.hs
+++ b/src/GHCMod.hs
@@ -10,7 +10,6 @@ import qualified Control.Exception as E
 import Data.Typeable (Typeable)
 import Data.Version (showVersion)
 import Language.Haskell.GhcMod
-import Language.Haskell.GhcMod.Ghc
 import Language.Haskell.GhcMod.Monad
 import Paths_ghc_mod
 import System.Console.GetOpt (OptDescr(..), ArgDescr(..), ArgOrder(..))
diff --git a/src/GHCModi.hs b/src/GHCModi.hs
index 16554c3..f380ff6 100644
--- a/src/GHCModi.hs
+++ b/src/GHCModi.hs
@@ -34,7 +34,6 @@ import Data.Version (showVersion)
 import GHC (GhcMonad)
 import qualified GHC as G
 import Language.Haskell.GhcMod
-import Language.Haskell.GhcMod.Ghc
 import Language.Haskell.GhcMod.Monad
 import Paths_ghc_mod
 import System.Console.GetOpt
@@ -116,7 +115,7 @@ replace (x:xs)    =  x  : replace xs
 ----------------------------------------------------------------
 
 setupDB :: MVar SymbolDb -> IO ()
-setupDB mvar = getSymbolDb >>= putMVar mvar
+setupDB mvar = loadSymbolDb >>= putMVar mvar
 
 ----------------------------------------------------------------