diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 1.4.2
+* fix: remove async from API document
+
 # 1.4.1
 * add viewport, charset, and async to auto generate API document
 
diff --git a/apiary.cabal b/apiary.cabal
--- a/apiary.cabal
+++ b/apiary.cabal
@@ -1,5 +1,5 @@
 name:                apiary
-version:             1.4.1
+version:             1.4.2
 synopsis:            Simple and type safe web framework that generate web API documentation.
 description:
   Simple and type safe web framework that can be automatically generate API documentation.
diff --git a/src/Data/Apiary/Document/Html.hs b/src/Data/Apiary/Document/Html.hs
--- a/src/Data/Apiary/Document/Html.hs
+++ b/src/Data/Apiary/Document/Html.hs
@@ -109,7 +109,7 @@
 
   where
     css u = H.link ! A.rel "stylesheet" ! A.href u
-    js  u = H.script ! A.src u ! A.async "async" $ mempty
+    js u = H.script ! A.src u $ mempty
     dataToggle = attribute "data-toggle" " data-toggle=\""
     dataTarget = attribute "data-target" " data-target=\""
 
@@ -117,8 +117,8 @@
 
     cdns = do
         css "http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css"
-        js  "http://code.jquery.com/jquery-2.1.1.min.js"
-        js  "http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"
+        js "http://code.jquery.com/jquery-2.1.1.min.js"
+        js "http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"
 
     embeds = $( do
         let embed f p = TH.runIO (readFile p) >>= \c -> [|$(TH.varE f) $ preEscapedToHtml (c :: String)|]