update docs

docs/guide/getting-started.md

@@ -71,6 +71,9 @@ Use `Create -> Naninovel -> Naninovel Script` assets context menu to create a na
 
 ::: info NOTE
 You can create and store naninovel scripts (as well as all the other Naninovel resources) under any project folder and organize them in any way you like; the naming is also up to you. The above illustration is just an example.
+
+::: warning
+Unity treats folders named `Resources` in a special manner: assets stored under such folders are force-included to the build, which may cause [performance issues](https://docs.unity3d.com/Manual/UnderstandingPerformanceResourcesFolder.html). Most importantly, never store anything under `Resources/Naninovel` folder, unless specifically required in the guide, as this may cause all sorts of conflicts and undefined behaviour.
 :::
 
 Naninovel scripts are text documents (`.nani` extension) where you control what happens on scenes. You can open and edit them with a text editor of your choice, like Microsoft Word, Google Docs or [VS Code](https://code.visualstudio.com).