diff --git a/CHANGES.md b/CHANGES.md
index a867bed..36a5877 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -3,8 +3,12 @@ HISTORY
 
 ## Unreleased
 
-The "fix" in version 5.1 broke `decorator.contextmanager` even more.
-This is now solved, thanks to Wim Glenn.
+## 5.1.1 (2022-01-07)
+
+Sangwoo Shim contributed a fix so that cythonized functions can be decorated.
+Brian McFee pointed out an issue in the `decorator_apply` example and
+Wim Glenn pointed out that the "fix" in version 5.1 broke
+`decorator.contextmanager` even more. Both issues are now solved.
 
 ## 5.1.0 (2021-09-11)
 
diff --git a/docs/documentation.md b/docs/documentation.md
index cbbc540..10ddb5f 100644
--- a/docs/documentation.md
+++ b/docs/documentation.md
@@ -3,9 +3,9 @@
 |Author | Michele Simionato|
 |---|---|
 |E-mail | michele.simionato@gmail.com|
-|Version| 5.1.0 (2021-09-11)|
+|Version| 5.1.1 (2022-01-07)|
 |Supports| Python 3.5, 3.6, 3.7, 3.8, 3.9, 3.10|
-|Download page| http://pypi.python.org/pypi/decorator/5.1.0|
+|Download page| http://pypi.python.org/pypi/decorator/5.1.1|
 |Installation| ``pip install decorator``|
 |License | BSD license|
 
@@ -923,7 +923,7 @@ You can use a ``FunctionMaker`` to implement that functionality as follows:
      is not a signature-preserving decorator.
      """
      return FunctionMaker.create(
-         func, 'return decfunc(%(signature)s)',
+         func, 'return decfunc(%(shortsignature)s)',
          dict(decfunc=dec(func)), __wrapped__=func)
 ```
 
diff --git a/src/decorator.py b/src/decorator.py
index 257b1b1..2479b6f 100644
--- a/src/decorator.py
+++ b/src/decorator.py
@@ -40,7 +40,7 @@
 from contextlib import _GeneratorContextManager
 from inspect import getfullargspec, iscoroutinefunction, isgeneratorfunction
 
-__version__ = '5.1.0'
+__version__ = '5.1.1'
 
 DEF = re.compile(r'\s*def\s*([_\w][_\w\d]*)\s*\(')
 POS = inspect.Parameter.POSITIONAL_OR_KEYWORD