diff --git a/docs/functions/core/flags/getters/why2_get_encryption_operation.md b/docs/functions/core/flags/getters/why2_get_encryption_operation.md
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@@ -0,0 +1,35 @@
+<!--
+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_get_encryption_operation
+
+## Parameters
+
+*This functions doesn't take any parameters.*
+
+## Attributes
+
+|                     |                                                                                             |
+| ------------------  | ------------------------------------------------------------------------------------------- |
+| **Return type**     | [`why2_encryption_operation_cb`](../../../../types/core/flags/why2_encryption_operation_cb) |
+| **Header comment**  | `RETURNS FUNCTION WHICH IS USED FOR ENCRYPTION & DECRYPTION`                                |
+| **Added in commit** | [`2a09a38acf48f0e57beb5135ab7f1fdb18e088fa`](https://github.com/ENGO150/WHY2/commit/2a09a38acf48f0e57beb5135ab7f1fdb18e088fa) |
+
+## Description
+
+Returns callback to `encryption_operation`, which is used during encryption/decryption for final string manipulation.
\ No newline at end of file
diff --git a/docs/functions/index.md b/docs/functions/index.md
index a29ee76..08277c9 100644
--- a/docs/functions/index.md
+++ b/docs/functions/index.md
@@ -54,6 +54,7 @@ You can find documentation for every *public* function of WHY2 below.
 | [`why2_get_default_flags`](./core/flags/getters/why2_get_default_flags) | This generates why2_input_flags with default values |
 | [`why2_get_flags`](./core/flags/getters/why2_get_flags) | Returns used flags                                            |
 | [`why2_no_output`](./core/flags/getters/why2_no_output) | Same as why2_get_default_flags() but for why2_output_flags    |
+| [`why2_get_encryption_operation`](./core/flags/getters/why2_get_encryption_operation) | Returns functions which is used for encryption & decryption |
 
 ## Logger