diff --git a/example/example11.ref b/example/example11.ref
index 4e04a3b..54e4fef 100644
--- a/example/example11.ref
+++ b/example/example11.ref
@@ -1,22 +1,22 @@
 Help on built-in function kw_func in module example
 
 kkww__ffuunncc(...)
-    kw_func(x : int, y : int)
+    kw_func(x : int, y : int) -> NoneType
 
 Help on built-in function kw_func2 in module example
 
 kkww__ffuunncc22(...)
-    kw_func2(x : int = 100L, y : int = 200L)
+    kw_func2(x : int = 100L, y : int = 200L) -> NoneType
 
 Help on built-in function kw_func3 in module example
 
 kkww__ffuunncc33(...)
-    kw_func3(data : unicode = u'Hello world!')
+    kw_func3(data : unicode = u'Hello world!') -> NoneType
 
 Help on built-in function kw_func4 in module example
 
 kkww__ffuunncc44(...)
-    kw_func4(myList : list<int> = [13L, 17L])
+    kw_func4(myList : list<int> = [13L, 17L]) -> NoneType
 
 kw_func(x=5, y=10)
 kw_func(x=5, y=10)
@@ -28,7 +28,7 @@
 kw_func(x=5, y=10)
 kw_func(x=5, y=10)
 Caught expected exception: Incompatible function arguments. The following argument types are supported:
-    1. (x : int = 100L, y : int = 200L)
+    1. (x : int = 100L, y : int = 200L) -> NoneType
 
 kw_func4: 13 17 
 kw_func4: 1 2 3 
diff --git a/example/example5.ref b/example/example5.ref
index 40a355c..d1da883 100644
--- a/example/example5.ref
+++ b/example/example5.ref
@@ -13,7 +13,7 @@
 Polly is a parrot
 Molly is a dog
 The following error is expected: Incompatible function arguments. The following argument types are supported:
-    1. (example.Dog)
+    1. (example.Dog) -> NoneType
 
 Callback function 1 called!
 False
diff --git a/include/pybind11/pybind11.h b/include/pybind11/pybind11.h
index 43cc02c..a9d5a12 100644
--- a/include/pybind11/pybind11.h
+++ b/include/pybind11/pybind11.h
@@ -81,7 +81,7 @@
 
         /* Generate a readable signature describing the function's arguments and return value types */
         using detail::descr;
-        PYBIND11_DESCR signature = cast_in::name();
+        PYBIND11_DESCR signature = cast_in::name() + detail::_(" -> ") + cast_out::name();
 
         /* Register the function with Python from generic (non-templated) code */
         initialize(rec, signature.text(), signature.types(), sizeof...(Args));
@@ -157,7 +157,7 @@
 
         /* Generate a readable signature describing the function's arguments and return value types */
         using detail::descr;
-        PYBIND11_DESCR signature = cast_in::name();
+        PYBIND11_DESCR signature = cast_in::name() + detail::_(" -> ") + cast_out::name();
 
         /* Register the function with Python from generic (non-templated) code */
         initialize(rec, signature.text(), signature.types(), sizeof...(Args));