diff --git a/csound-expression.cabal b/csound-expression.cabal
--- a/csound-expression.cabal
+++ b/csound-expression.cabal
@@ -1,5 +1,5 @@
 Name:          csound-expression
-Version:       3.0.0
+Version:       3.0.1
 Cabal-Version: >= 1.6
 License:       BSD3
 License-file:  LICENSE
diff --git a/src/Csound/Control/Evt.hs b/src/Csound/Control/Evt.hs
--- a/src/Csound/Control/Evt.hs
+++ b/src/Csound/Control/Evt.hs
@@ -111,7 +111,7 @@
 --
 -- When value @a@ happens with @evt@, the resulting event stream contains
 -- a value (z `f` a) and in the next time @z@ equals to this value.
-appendE :: Tuple a => a -> (a -> a -> a) => Evt a -> Evt a
+appendE :: Tuple a => a -> (a -> a -> a) -> Evt a -> Evt a
 appendE empty append = accumE empty phi
     where phi a s = let s1 = s `append` a in (s1, s1)