diff --git a/library/Require.hs b/library/Require.hs
--- a/library/Require.hs
+++ b/library/Require.hs
@@ -80,7 +80,8 @@
   &   filter (\t -> not $ "autorequire" `Text.isPrefixOf` t)
   &   zip [1..]
   >>= prependAfterModuleLine
-  <&> (\(ln, text) -> maybe (lineTag filename (LineNumber ln) <> text <> "\n") (renderImport filename (LineNumber ln)) $ Megaparsec.parseMaybe requireParser text )
+  <&> (\(ln, text) -> maybe (text <> "\n") (renderImport filename (LineNumber ln)) $ Megaparsec.parseMaybe requireParser text)
+  &   (lineTag filename (LineNumber 1) :)
   &   Text.concat
  where
   enumeratedPrepend ln
@@ -114,7 +115,7 @@
 renderImport filename linenumber RequireInfo {..} =
   case (Text.isInfixOf riFullModuleName (unFileName filename)) of
     True  -> ""
-    False -> lineTag filename linenumber <> typesImport <> lineTag filename linenumber <> qualifiedImport
+    False -> typesImport <> lineTag filename linenumber <> qualifiedImport
  where
   types = maybe (Text.takeWhileEnd (/= '.') riFullModuleName) (Text.intercalate ",") riImportedTypes
   typesImport = "import " <> riFullModuleName <> " (" <> types <> ")\n"
@@ -137,9 +138,15 @@
 
   types'  <- Megaparsec.option Nothing $ do
     void $ Megaparsec.char '('
-    t' <- Megaparsec.some (Megaparsec.alphaNumChar <|> Megaparsec.char ',' <|> Megaparsec.char ' ')
+    t' <- Megaparsec.many (Megaparsec.alphaNumChar <|> Megaparsec.char ',' <|> Megaparsec.char ' ')
     void $ Megaparsec.char ')'
     return $ Just t'
+
+  void $ Megaparsec.option Nothing $ do
+    void $ Megaparsec.space
+    void $ Megaparsec.some (Megaparsec.char '-')
+    void $ Megaparsec.many (Megaparsec.alphaNumChar <|> Megaparsec.char ' ')
+    return Nothing
 
   return RequireInfo
     { riFullModuleName = toText $ module'
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name: require
-version: '0.4.2'
+version: "0.4.3"
 github: "theam/require"
 license: Apache-2.0
 author: "The Agile Monkeys"
@@ -11,12 +11,12 @@
 license-file: LICENSE.md
 
 extra-source-files:
-- CHANGELOG.md
-- LICENSE.md
-- package.yaml
-- README.md
-- stack.yaml
-- Requires
+  - CHANGELOG.md
+  - LICENSE.md
+  - package.yaml
+  - README.md
+  - stack.yaml
+  - Requires
 
 ghc-options: -Wall
 
@@ -45,42 +45,42 @@
     source-dirs: executable/Require/
     main: Main.hs
     dependencies:
-    - require
+      - require
     ghc-options:
-    - -rtsopts
-    - -threaded
-    - -with-rtsopts=-N
+      - -rtsopts
+      - -threaded
+      - -with-rtsopts=-N
   autorequirepp:
     source-dirs: executable/AutoRequire/
     main: Main.hs
     dependencies:
       - require
     ghc-options:
-    - -rtsopts
-    - -threaded
-    - -with-rtsopts=-N
+      - -rtsopts
+      - -threaded
+      - -with-rtsopts=-N
 
 benchmarks:
   require-benchmarks:
     source-dirs: benchmark
     main: Main.hs
     dependencies:
-    - require
-    - criterion
+      - require
+      - criterion
     ghc-options:
-    - -rtsopts
-    - -threaded
-    - -with-rtsopts=-N
+      - -rtsopts
+      - -threaded
+      - -with-rtsopts=-N
 
 tests:
   require-test-suite:
     source-dirs: test-suite
     main: Main.hs
     dependencies:
-    - require
-    - tasty
-    - tasty-hspec
+      - require
+      - tasty
+      - tasty-hspec
     ghc-options:
-    - -rtsopts
-    - -threaded
-    - -with-rtsopts=-N
+      - -rtsopts
+      - -threaded
+      - -with-rtsopts=-N
diff --git a/require.cabal b/require.cabal
--- a/require.cabal
+++ b/require.cabal
@@ -1,10 +1,13 @@
--- This file has been generated from package.yaml by hpack version 0.28.2.
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.31.2.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: d137a452230c193641b2f17f7eaca960c2f427449f4d9c1197cfb30248c4c870
+-- hash: b6f56fcb124b24c06d107d84591eb1a3d5581c86e84fdff75f098b7af8f5cf51
+
 name:           require
-version:        0.4.2
+version:        0.4.3
 synopsis:       Scrap your qualified import clutter
 description:    See <https://theam.github.io/require>
 category:       Other
@@ -16,14 +19,13 @@
 license:        Apache-2.0
 license-file:   LICENSE.md
 build-type:     Simple
-cabal-version:  >= 1.10
 extra-source-files:
     CHANGELOG.md
     LICENSE.md
     package.yaml
     README.md
-    Requires
     stack.yaml
+    Requires
 
 source-repository head
   type: git
diff --git a/test-suite/Main.hs b/test-suite/Main.hs
--- a/test-suite/Main.hs
+++ b/test-suite/Main.hs
@@ -1,8 +1,8 @@
-import Universum
+import           Universum
 
+import qualified Data.Text        as Text
 import qualified Test.Tasty
-import Test.Tasty.Hspec
-import qualified Data.Text as Text
+import           Test.Tasty.Hspec
 
 import qualified Require
 
@@ -64,4 +64,18 @@
     let actual = toString $ Require.transform False (Require.FileName "Foo.hs") "" input
     actual `shouldContain`   expectedTypeImport
     actual `shouldContain`   expectedQualifiedImport
+
+  it "skips comments" $ do
+    let input    = "require Data.Text -- test of comments"
+    let expected = "import Data.Text (Text)"
+    let actual   = Require.transform False (Require.FileName "Foo.hs") "" input
+    expected `Text.isInfixOf` actual
+
+  it "allows empty parentheses" $ do
+    let input       = "require Data.Text ()"
+    let expected1   = "import Data.Text ()"
+    let expected2   = "import qualified Data.Text as Text"
+    let actual      = lines $ Require.transform False (Require.FileName "Foo.hs") "" input
+    actual `shouldSatisfy` elem expected1
+    actual `shouldSatisfy` elem expected2