diff --git a/lens-tutorial.cabal b/lens-tutorial.cabal
--- a/lens-tutorial.cabal
+++ b/lens-tutorial.cabal
@@ -1,5 +1,5 @@
 Name: lens-tutorial
-Version: 1.0.1
+Version: 1.0.2
 Cabal-Version: >=1.10
 Build-Type: Simple
 License: BSD3
@@ -37,5 +37,5 @@
     GHC-Options: -O2 -Wall
     Default-Language: Haskell2010
     Build-Depends:
-        base                            ,
+        base                      < 5   ,
         doctest      >= 0.9.12 && < 0.11
diff --git a/src/Control/Lens/Tutorial.hs b/src/Control/Lens/Tutorial.hs
--- a/src/Control/Lens/Tutorial.hs
+++ b/src/Control/Lens/Tutorial.hs
@@ -262,7 +262,7 @@
     However, sometimes Template Haskell is not an option, so we can also use
     the `lens` utility function to build lenses.  This utility has type:
 
-> lens :: (a -> b) -> (b -> a -> a) -> Lens' a b
+> lens :: (a -> b) -> (a -> b -> a) -> Lens' a b
 
     The first argument is a \"getter\" (a way to extract a @\'b\'@ from an
     @\'a\'@).  The second argument is a \"setter\" (given a @b@, update an
@@ -270,7 +270,7 @@
     use `lens` like this:
 
 > point :: Lens' Atom Point
-> point = lens _point (\newPoint atom -> atom { _point = newPoint })
+> point = lens _point (\atom newPoint -> atom { _point = newPoint })
 
     You can even define lenses without incurring a dependency on the @lens@
     library.  Remember that lenses are just higher-order functions over