diff --git a/README.md b/README.md
index 5c5b17d..414b235 100644
--- a/README.md
+++ b/README.md
@@ -750,51 +750,61 @@ Itertools
 from itertools import *
 ```
 
-### Chain
-```python
->>> chain([1, 2], range(3, 5))
-[1, 2, 3, 4]
-```
+### Math
 
-### Combinations
+#### Combinations:
 ```python
 >>> combinations('abc', 2)
 [('a', 'b'), ('a', 'c'), ('b', 'c')]
 ```
 
-### Permutations
+#### Combinations with Replacement:
+```python
+>>> ombinations_with_replacement('abc', 2)
+[('a', 'a'), ('a', 'b'), ('a', 'c'), ('b', 'b'), ('b', 'c'), ('c', 'c')]
+```
+
+#### Permutations:
 ```python
 >>> permutations('abc', 2)
 [('a', 'b'), ('a', 'c'), ('b', 'a'), ('b', 'c'), ('c', 'a'), ('c', 'b')]
 ```
 
-### Product
+#### Product:
 ```python
->>> list(product('ab', [1, 2]))
+>>> product('ab', [1, 2])
 [('a', 1), ('a', 2), ('b', 1), ('b', 2)]
 ```
 
-### Compress
+### Util
+
+#### Chain:
+```python
+>>> chain([1, 2], range(3, 5))
+[1, 2, 3, 4]
+```
+
+#### Compress:
 ```python
 >>> compress('abc', [True, 0, 23])
 ['a', 'c']
 ```
 
-### Count
+### Count:
 ```python
 >>> i = count(5, 2)
 >>> next(i), next(i)
 (5, 7)
 ```
 
-### Cycle
+#### Cycle:
 ```python
 >>> a = cycle('abc')
 >>> [next(a) for _ in range(10)]
 ['a', 'b', 'c', 'a', 'b', 'c', 'a', 'b', 'c', 'a']
 ```
 
-### Groupby
+#### Groupby:
 ```python
 >>> a = [{'id': 1, 'name': 'bob'}, 
          {'id': 2, 'name': 'bob'}, 
@@ -805,7 +815,7 @@ from itertools import *
  'peter': [{'id': 3, 'name': 'peter'}]}
 ```
 
-### Islice
+#### Islice:
 ```python
 islice([1, 2, 3], 1, None)
 [2, 3]
@@ -850,6 +860,14 @@ False
 >>> setattr(z, 'c', 10)
 ```
 
+### Parameters
+```python
+>>> from inspect import signature
+>>> sig = signature(bla)
+>>> len(sig.parameters)
+3
+```
+
 ### Type
 **Type is the root class. If only passed the object it returns it's type. Otherwise it creates a new class (and not the instance!):**
 ```python
@@ -861,6 +879,7 @@ type(class_name, parents<tuple>, attributes<dict>)
 >>> z = Z()
 ```
 
+
 ### MetaClass
 #### Class that creates class:
 ```python