diff --git a/docs/functions/core/memory/why2_realloc.md b/docs/functions/core/memory/why2_realloc.md
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@@ -0,0 +1,38 @@
+<!--
+This is part of WHY2
+Copyright (C) 2022 Václav Šmejkal
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+# why2_realloc
+
+## Parameters
+
+| Identifier | Data type       |
+| ---------- | --------------- |
+| `pointer`  | `void *`        |
+| `size`     | `unsigned long` |
+
+## Attributes
+
+|                     |                                                |
+| ------------------  | ---------------------------------------------- |
+| **Return type**     | `void *`                                       |
+| **Header comment**  | `THIS DOESN'T PRESERVE CONTENT OF pointer!`    |
+| **Added in commit** | [`8af6bd45c38e780bb14d99aee0a572b028c186b6`](https://github.com/ENGO150/WHY2/commit/8af6bd45c38e780bb14d99aee0a572b028c186b6) |
+
+## Description
+
+Function deallocates `pointer` (only applicable if `pointer` was allocated using WHY2-memory), passes `size` into [`malloc`](https://linux.die.net/man/3/malloc) function and returns the output value. The value is also pushed to [`linked-list`](../../../../types/core/llist/why2_list_t) for garbage collector.
\ No newline at end of file
diff --git a/docs/functions/index.md b/docs/functions/index.md
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--- a/docs/functions/index.md
+++ b/docs/functions/index.md
@@ -87,10 +87,11 @@ You can find documentation for every *public* function of WHY2 below.
 
 ### Memory
 
-| Function                                   | Description                                    |
-| ------------------------------------------ | ---------------------------------------------- |
-| [`why2_malloc`](./core/memory/why2_malloc) | *This functions doesn't have any description.* |
-| [`why2_calloc`](./core/memory/why2_calloc) | *This functions doesn't have any description.* |
+| Function                                     | Description                                    |
+| -------------------------------------------- | ---------------------------------------------- |
+| [`why2_malloc`](./core/memory/why2_malloc)   | *This functions doesn't have any description.* |
+| [`why2_calloc`](./core/memory/why2_calloc)   | *This functions doesn't have any description.* |
+| [`why2_realloc`](./core/memory/why2_realloc) | This doesn't preserve content of pointer!      |
 
 ## Logger