diff --git a/apiary-eventsource.cabal b/apiary-eventsource.cabal
--- a/apiary-eventsource.cabal
+++ b/apiary-eventsource.cabal
@@ -1,5 +1,5 @@
 name:                apiary-eventsource
-version:             0.11.3
+version:             0.11.4
 synopsis:            eventsource support for apiary web framework.
 description:
   example: <https://github.com/philopon/apiary/blob/master/examples/eventsource.hs>
@@ -23,7 +23,7 @@
 library
   exposed-modules:     Web.Apiary.EventSource
   build-depends:       base              >=4.6    && <4.8
-                     , apiary            >=0.11.3 && <0.12
+                     , apiary            >=0.11.3 && <0.13
                      , blaze-builder     >=0.3    && <0.4
   if flag(wai2apiary)
     build-depends:     wai-eventsource   >=2.0    && <3.0
diff --git a/src/Web/Apiary/EventSource.hs b/src/Web/Apiary/EventSource.hs
--- a/src/Web/Apiary/EventSource.hs
+++ b/src/Web/Apiary/EventSource.hs
@@ -39,12 +39,14 @@
         Just b  -> send b >> flush >> loop
 #endif
 
+-- | eventsource with io action. since 0.11.3.
 eventSourceIO :: Monad m => IO ServerEvent -> ActionT m ()
 eventSourceIO io = do
     status status200
     contentType "text/event-stream"
     stream $ ioToSource io
 
+-- | eventsource with chan. since 0.11.3.
 eventSourceChan :: MonadIO m => Chan ServerEvent -> ActionT m ()
 eventSourceChan chan = do
     chan' <- liftIO $ dupChan chan