diff --git a/Text/PrettyPrint/Free/Internal.hs b/Text/PrettyPrint/Free/Internal.hs
--- a/Text/PrettyPrint/Free/Internal.hs
+++ b/Text/PrettyPrint/Free/Internal.hs
@@ -135,7 +135,7 @@
 import Prelude hiding (foldr1)
 
 infixr 5 </>,<//>,`above`,`aboveBreak`
-infixr 6 <+>
+infixl 6 <+>
 
 -----------------------------------------------------------
 -- list, tupled and semiBraces pretty print a list of
diff --git a/wl-pprint-extras.cabal b/wl-pprint-extras.cabal
--- a/wl-pprint-extras.cabal
+++ b/wl-pprint-extras.cabal
@@ -1,6 +1,6 @@
 name:          wl-pprint-extras
 category:      Control, Monads, Text
-version:       1.3
+version:       1.4
 cabal-version: >= 1.6
 license:       BSD3
 license-file:  LICENSE