diff --git a/authoring.cabal b/authoring.cabal
--- a/authoring.cabal
+++ b/authoring.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                authoring
-version:             0.3.3
+version:             0.3.3.1
 synopsis:            A library for writing papers
 description:         This package is a combinator library for writing papers.
 homepage:            http://github.com/nushio3/authoring
diff --git a/src/Text/Authoring/Combinator/Cite.hs b/src/Text/Authoring/Combinator/Cite.hs
--- a/src/Text/Authoring/Combinator/Cite.hs
+++ b/src/Text/Authoring/Combinator/Cite.hs
@@ -18,11 +18,13 @@
 import Text.Authoring.State
 
 
+-- | Cite a list of documents
 citet, citep :: MonadAuthoring s w m => [String] -> m ()
 
 citet = citationGen "citet"
 citep = citationGen "citep"
 
+-- | Cite a single document
 citet1, citep1 :: MonadAuthoring s w m => String -> m ()
 
 citet1 = citationGen "citet" . (:[]) -- + ---<===   I am a long man lying