diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,1 +1,29 @@
-Copyright (c) 2008-2014 Utrecht University. All rights reserved.
+Copyright (c) 2008-2014, Utrecht University (Atze Dijkstra, Stefan Holdermans).
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/src/CCO/Feedback.hs b/src/CCO/Feedback.hs
--- a/src/CCO/Feedback.hs
+++ b/src/CCO/Feedback.hs
@@ -36,6 +36,8 @@
 import CCO.Feedback.Message
 import CCO.Printing          (Doc, text)
 import System.IO             (Handle)
+import Control.Monad
+import Control.Applicative
 
 -------------------------------------------------------------------------------
 -- The Feedback monad
@@ -60,6 +62,10 @@
   Fail msgs      >>= _ = Fail msgs
 
   fail msg             = Fail [Error (text msg)]
+
+instance Applicative Feedback where
+  pure = return
+  (<*>) = ap
 
 -- | Issues a list of 'Message's.
 -- Fails if the list contains an 'Error' message.
diff --git a/src/CCO/Printing.hs b/src/CCO/Printing.hs
--- a/src/CCO/Printing.hs
+++ b/src/CCO/Printing.hs
diff --git a/uu-cco.cabal b/uu-cco.cabal
--- a/uu-cco.cabal
+++ b/uu-cco.cabal
@@ -1,5 +1,5 @@
 name:                  uu-cco
-version:               0.1.0.1
+version:               0.1.0.3
 synopsis:              Utilities for compiler construction: core functionality
 description:           A small utility library accompanying the course on
                        Compiler Construction (INFOMCCO) at Utrecht Univerity.