Update documentation

documentation/Overview/features_overview.md

@@ -6,5 +6,6 @@ The C Macro Collections library comes with some core features available to all c
 | ------- | ----------- |
 | [Callbacks](../cor/callbacks/index.html) | Callbacks are functions that are called when an operation is successful. These operations are divided in 5 categories (create, read, update, delete, resize). |
 | [Custom Allocation](../cor/custom_allocation/index.html) | Allows you to use your own custom dynamic memory allocation functions inside the collections. |
+| [Error Codes](../cor/error_codes/index.md) | Error codes that can be used to treat certain common errors when operating on a collection. |
 | [Functions Table](../cor/functions_table/index.html) | A standard way to access required behaviors from the custom data types. Things like hash, comparison, freeing from memory if needed, etc. |
 | [Iterators](../cor/iterators/index.html) | Iterators are a simplified access to the values of a collection. |