Update README.md

Author: ManlyMarco

README.md

@@ -17,6 +17,7 @@ Note: The .xml file include in the release zip is useful for plugin developers w
 
 ### Known issues
 - If no text is visible anywhere in RUE windows, most likely the `Arial.ttf` font is missing from the system (Unity UI default font, may be different in some games). This can happen when running a game on Linux with [misconfigured wine](https://github.com/ManlyMarco/RuntimeUnityEditor/issues/55).
+- The IL2CPP version currently only works in some games that have unstripped `UnityEngine.IMGUIModule.dll` (support for some of the games can be added with a patcher that restores missing members, [example](https://github.com/IllusionMods/BepisPlugins/tree/fe2c5e14c8bcb14602ba5380226aee3ddd20b2f8/src/IMGUIModule.Il2Cpp.CoreCLR.Patcher)).
 
 ## How to make my mod compatible?
 ConfigurationManager will automatically display all settings from your plugin's `Config`. All metadata (e.g. description, value range) will be used by ConfigurationManager to display the settings to the user.