Why doesn't LWRPCustomCameraEditor add a label?

LWRPCustomCameraEditor.cs

using UnityEngine;
using UnityEditor;
using UnityEngine.Experimental.Rendering.LightweightPipeline;
using UnityEditor.Experimental.Rendering.LightweightPipeline;

//[CustomEditor(typeof(Camera))]
[CustomEditorForRenderPipeline(typeof(Camera), typeof(LightweightRenderPipelineAsset))]
//public class LWRPCustomCameraEditor : Editor {
public class LWRPCustomCameraEditor : CameraEditor {

	public override void OnInspectorGUI () {
		base.OnInspectorGUI();
		GUILayout.Label("test");
	}

}