Update docs

README.md

@@ -102,6 +102,15 @@ A radio button menu with a field name of **'Example1'**, and a submitted value o
 ```
 
 You are able to set-up complex conditions to show a certain form-page.
+The following PHP functions can be used within the condition:
+
+- floatval
+- strval
+- intval
+- in_array
+- str_contains
+
+If more functionality is needed, feel free to create a feature edit.
 
 ### Buttons
 
@@ -155,4 +164,4 @@ This project is licensed under the AGPL-3.0 License — check  <a href="/oveleon
 
 ## Sponsoring
 
-If you find this plugin useful, please consider [sponsoring us](https://github.com/sponsors/oveleon) to help contribute to our time invested and to further development of this and other open source projects. Thank you for your support! - [Oveleon](https://www.oveleon.de).
+If you find this plugin useful, please consider [sponsoring us](https://github.com/sponsors/oveleon) to help contribute to our time invested and to further development of this and other open source projects. Thank you for your support! - [Oveleon](https://www.oveleon.de).