diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 79e66d0..1cba70f 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -31,3 +31,22 @@ Now you can start working on the project.
     * Keep the `src` folder clean from anything that is not source code;
     * Create a new folder for each example with a meaningful name if it has more than one file;
 3. If something looks complicated, explain it as well as possible
+4. All source files (`.c`, `.h`, etc) must contain a header with the following template:
+    * Complete file name.
+    * First commit date in `dd/mm/yyyy`.
+    * Authors name with (optional) github link to his page.
+
+```
+/**
+ * file_name.c
+ *
+ * Creation Date: dd/mm/yyyy
+ *
+ * Authors:
+ * Author 1 Name (https://github.com/AuthorGithubPage)
+ * Author 2 Name
+ *
+ */
+```
+
+**Make sure your name is listed in the AUTHORS file**
diff --git a/Documentation.md b/Documentation.md
index 8151d2d..f06ff11 100644
--- a/Documentation.md
+++ b/Documentation.md
@@ -59,6 +59,13 @@ A contiguous growable array. Elements can be added and removed from both ends of
 * [\_full()](#list_full)
 * [\_count()](#list_count)
 * [\_capacity()](#list_capacity)
+* [\_iter\_new()](#list_iter_new)
+* [\_iter\_start()](#list_iter_start)
+* [\_iter\_end()](#list_iter_end)
+* [\_iter\_tostart()](#list_iter_tostart)
+* [\_iter\_toend()](#list_iter_toend)
+* [\_iter\_next()](#list_iter_next)
+* [\_iter\_prev()](#list_iter_prev)
 
 ## [<span id="list_new"> \_new() </span>](#list_function_index)
 
@@ -248,8 +255,8 @@ Adds an element at a given index if the condition evaluates to true.
 
 #### Returns
 
-1. `true` - If the element was successfully removed from the list.
-2. `false` - If the list is empty.
+1. `true` - If the element was successfully added to the list.
+2. `false` - If the condition evaluated to false, or if `index` is greater than the list `count`.
 
 #### Complexity
 
@@ -273,7 +280,7 @@ Removes an element from a given index if the condition evaluates to true.
 #### Returns
 
 1. `true` - If the element was successfully removed from the list.
-2. `false` - If the list is empty.
+2. `false` - If the condition evaluated to false, if the list is empty, or if the index is greater than or equal to the list `count`.
 
 #### Complexity
 
@@ -426,6 +433,143 @@ Returns the internal buffer's current capacity.
 
 * O(1)
 
+## [<span id="list_iter_new"> \_iter\_new() </span>](#list_function_index)
+
+Initializes an iterator with a given target list. The iterator's cursor will be positioned at the beginning of the list.
+
+#### Declaration
+
+> `FMOD void PFX##_iter_new(SNAME##_iter *iter, SNAME *target);`
+
+#### Parameters
+
+1. `SNAME##_iter *iter` - Iterator to be initialized.
+2. `SNAME *_list_` - Target list.
+
+#### Complexity
+
+* O(1)
+
+## [<span id="list_iter_start"> \_iter\_start() </span>](#list_function_index)
+
+Returns true if the iterator has reached the start of the list. If false, the iterator is still possible to iterate to a previous element.
+
+#### Declaration
+
+> `FMOD bool PFX##_iter_start(SNAME##_iter *iter);`
+
+#### Parameters
+
+1. `SNAME##_iter *iter` - Target iterator.
+
+#### Returns 
+
+1. `true` - If the iterator has reached the start of the list.
+2. `false` - If the iterator has not reached the start of the list.
+
+#### Complexity
+
+* O(1)
+
+## [<span id="list_iter_end"> \_iter\_end() </span>](#list_function_index)
+
+Returns true if the iterator has reached the end of the list. If false, the iterator is still possible to iterate to a next element.
+
+#### Declaration
+
+> `FMOD bool PFX##_iter_end(SNAME##_iter *iter);`
+
+#### Parameters
+
+1. `SNAME##_iter *iter` - Target iterator.
+
+#### Returns 
+
+1. `true` - If the iterator has reached the end of the list.
+2. `false` - If the iterator has not reached the end of the list.
+
+#### Complexity
+
+* O(1)
+
+## [<span id="list_iter_tostart"> \_iter\_tostart() </span>](#list_function_index)
+
+Moves the cursor of the target iterator to the start of the list.
+
+#### Declaration
+
+> `FMOD void PFX##_iter_tostart(SNAME##_iter *iter);`
+
+#### Parameters
+
+1. `SNAME##_iter *iter` - Target iterator.
+
+#### Complexity
+
+* O(1)
+
+## [<span id="list_iter_toend"> \_iter\_toend() </span>](#list_function_index)
+
+Moves the cursor of the target iterator to the end of the list.
+
+#### Declaration
+
+> `FMOD void PFX##_iter_toend(SNAME##_iter *iter);`
+
+#### Parameters
+
+1. `SNAME##_iter *iter` - Target iterator.
+
+#### Complexity
+
+* O(1)
+
+## [<span id="list_iter_next"> \_iter\_next() </span>](#list_function_index)
+
+This function is used to iterate to the next element, retrieving the current one, along with an index that represents how many iterations have passed. When the index is `0` it means that the current result is the first element in the list; if it equals `count - 1` then it is the last element in the list.
+
+#### Declaration
+
+> `FMOD bool PFX##_iter_next(SNAME##_iter *iter, V *result, size_t *index);`
+
+#### Parameters
+
+1. `SNAME##_iter *iter` - Target iterator.
+2. `V *result` - Resulting value from the list.
+3. `size_t *index` - Resulting index.
+
+#### Returns 
+
+1. `true` - If the iterator has retrieved a valid `result` and `index`.
+2. `false` - If the iterator has not retrieved a valid `result` and `index`. Here, iteration to the next element has ended.
+
+#### Complexity
+
+* O(1)
+
+## [<span id="list_iter_prev"> \_iter\_prev() </span>](#list_function_index)
+
+This function is used to iterate to the previous element, retrieving the current one, along with an index that represents how many iterations have passed. When the index is `0` it means that the current result is the first element in the list; if it equals `count - 1` then it is the last element in the list.
+
+#### Declaration
+
+> `FMOD bool PFX##_iter_prev(SNAME##_iter *iter, V *result, size_t *index);`
+
+#### Parameters
+
+1. `SNAME##_iter *iter` - Target iterator.
+2. `V *result` - Resulting value from the list.
+3. `size_t *index` - Resulting index.
+
+#### Returns 
+
+1. `true` - If the iterator has retrieved a valid `result` and `index`.
+2. `false` - If the iterator has not retrieved a valid `result` and `index`. Here, iteration to the previous element has ended.
+
+#### Complexity
+
+* O(1)
+
 # [LinkedList](#collections_index)
 
 A list where each element is linked by nodes. Elements can be added and removed from both ends of the list and also in the middle. The linked list can be used to implement other data structures like queues, stacks and deques.