Update README.md

Author: EvaisaDev

README.md

@@ -16,8 +16,10 @@
 3. Move contents of `GameFolder/GameName_Data/Managed` into `NetcodePatcher/deps`
 
 ## Preparing mods for patching
-To ensure that the patched NetworkBehaviours are initialized properly, add the following code snippet to your mod, in a place where it will only run once, such as `Awake()`
-- **It is very important that it only runs once!**
+- Mods must be built against .net standard 2.1 in order for this tool to work.
+- Make sure Debug Symbols is set to `Portable`
+- To ensure that the patched NetworkBehaviours are initialized properly, add the following code snippet to your mod, in a place where it will only run once, such as `Awake()`
+	- **It is very important that it only runs once!**
 	```cs
 	var types = Assembly.GetExecutingAssembly().GetTypes();
 	foreach (var type in types)