Update README.md

Author: TROPHiT

README.md

@@ -28,9 +28,10 @@ You will have to use the provided UnityPlayerActivity subclass as follows:
 <activity android:name="com.trophit.MyUnityPlayerActivity">
 ```
 
-* Optional: by default, *MyUnityPlayerActivity* calls a Unity script method `onDeeplink` on a game object called *UnityDeeplinks*. If you wish to change the name of the object or method, you should edit *MyUnityPlayerActivity.java*, change the values of the `gameObject` and/or `deeplinkMethod` static properties and rebuild the *UnityDeeplinks.jar* file as instructed below
+* Optional: by default, *MyUnityPlayerActivity* calls a Unity script method `onDeeplink` on a game object called *UnityDeeplinks*. If you wish to change the name of the object or method, you should edit *Assets/UnityDeeplinks/Android/MyUnityPlayerActivity.java*, change the values of the `gameObject` and/or `deeplinkMethod` static properties and rebuild the *UnityDeeplinks.jar* file as instructed below
 
 ### Building the UnityDeeplinks.jar file
+Only perform this step if you made changes to *Assets/UnityDeeplinks/Android/MyUnityPlayerActivity.java* or would like to rebuild it using an updated version of Unity classes, Android SDK, JDK and so on.
 
 #### Prerequisites
 * Go to your Unity => Preferences => External tools menu and find your Android SDK and JDK home folders