Merge pull request #204 from Unity-Technologies/Uni-23220_add_tooltip_to_the_item_in_FBXprefab

Uni-23220 fix tooltip in FBXPrefab

Author: inwoods

Assets/FbxExporters/Editor/FbxPrefabInspector.cs

@@ -18,7 +18,7 @@ public override void OnInspectorGUI() {
 
             var fbxPrefabUtility = new FbxPrefabAutoUpdater.FbxPrefabUtility (fbxPrefab);
             var oldFbxAsset = fbxPrefabUtility.GetFbxAsset();
-            var newFbxAsset = EditorGUILayout.ObjectField("Source Fbx Asset", oldFbxAsset,
+            var newFbxAsset = EditorGUILayout.ObjectField(new GUIContent("Source Fbx Asset", "The FBX file that is linked to this Prefab"), oldFbxAsset,
                     typeof(GameObject), allowSceneObjects: false) as GameObject;
             if (newFbxAsset && !AssetDatabase.GetAssetPath(newFbxAsset).EndsWith(".fbx")) {
                 Debug.LogError("FbxPrefab must point to an Fbx asset (or none).");