diff --git a/README.md b/README.md
index bba2054..4584530 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,20 @@
 # BAT (blender asset tracer)
 
 Modified version
-with Zip packer included
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+with Zip packer included
+
+
+Zip behavior
+the root folder of the zip use first the environment variable `ZIP_ROOT` (used with `os.getenv('ZIP_ROOT')`)
+
+If there is no such env variable it fallback to path specified in addon preferences.
+
+This root can be manually changed in the settings (sidebar) of the export browser windows.
+
+
+### Changelog
+
+1.3.1
+
+- added: prefs for file zipper (fallback to this if env is not defined)
+- changed: zip operator id_name `bpy.ops.adm.export_zip` >> `bpy.opsbat.export_zip`
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diff --git a/__init__.py b/__init__.py
index 5e250b7..490ba9e 100644
--- a/__init__.py
+++ b/__init__.py
@@ -25,7 +25,7 @@ __version__ = '1.3'
 bl_info = {
     "name": "Blender Asset Tracer",
     "author": "Campbell Barton, Sybren A. Stüvel, Loïc Charrière and Clément Ducarteron",
-    "version": (1, 3, 0),
+    "version": (1, 3, 1),
     "blender": (2, 80, 0),
     "location": "File > External Data > BAT",
     "description": "Utility for packing blend files",
@@ -47,7 +47,7 @@ import sys
 import subprocess
 import tempfile
 from blender_asset_tracer.trace import deps
-
+from . import preferences
 
 class ExportBatPack(Operator, ExportHelper):
     bl_idname = "export_bat.pack"
@@ -86,10 +86,10 @@ class ExportBatPack(Operator, ExportHelper):
         return {'FINISHED'}
 
 
-class ADM_OT_export_zip(Operator, ExportHelper):
+class BAT_OT_export_zip(Operator, ExportHelper):
     """Export current blendfile as .ZIP"""
     bl_label = "Export File to .ZIP"
-    bl_idname = "adm.export_zip"
+    bl_idname = "bat.export_zip"
     
     filename_ext = '.zip'
     
@@ -105,6 +105,13 @@ class ADM_OT_export_zip(Operator, ExportHelper):
     def poll(cls, context):
         return bpy.data.is_saved
 
+    ## ExportHelper has it's own invoke so overriding it with this one create error
+    # def invoke(self, context, event):
+    #     prefs = preferences.get_addon_prefs()
+    #     if prefs.root_default:
+    #         self.root_dir = prefs.root_default
+    #     return self.execute(context)
+
     def execute(self, context):
 
         root_dir = self.root_dir
@@ -249,18 +256,21 @@ def menu_func(self, context):
     layout = self.layout
     layout.separator()
     layout.operator(ExportBatPack.bl_idname)
-    filepath = layout.operator(ADM_OT_export_zip.bl_idname)
+    filepath = layout.operator(BAT_OT_export_zip.bl_idname)
     root_dir_env = os.getenv('ZIP_ROOT')
+    if not root_dir_env: # if no env use prefs instead
+        root_dir_env = preferences.get_addon_prefs().root_default
     filepath.root_dir = '' if root_dir_env == None else root_dir_env #os.getenv('PROJECT_STORE')
 
 
 classes = (
     ExportBatPack,
-    ADM_OT_export_zip,
+    BAT_OT_export_zip,
 )
 
 
 def register():
+    preferences.register()
     for cls in classes:
         bpy.utils.register_class(cls)
 
@@ -271,6 +281,7 @@ def unregister():
     for cls in classes:
         bpy.utils.unregister_class(cls)
 
+    preferences.unregister()
     bpy.types.TOPBAR_MT_file_external_data.remove(menu_func)
 
 
diff --git a/preferences.py b/preferences.py
new file mode 100644
index 0000000..1b17f4c
--- /dev/null
+++ b/preferences.py
@@ -0,0 +1,46 @@
+import bpy
+from bpy.props import (FloatProperty,
+                        BoolProperty,
+                        EnumProperty,
+                        StringProperty,
+                        IntProperty,
+                        PointerProperty)
+
+def get_addon_prefs():
+    prefs = bpy.context.preferences
+    return prefs.addons[__package__].preferences
+
+class myaddonPrefs(bpy.types.AddonPreferences):
+    bl_idname = __name__.split('.')[0]
+
+    root_default : bpy.props.StringProperty(
+        name='Default Root',
+        description="Default root folder path when using export to Zip",
+        subtype='DIR_PATH',
+        default='')
+
+    def draw(self, context):
+            layout = self.layout
+            col = layout.column()
+            col.label(text='Export to Zip preferences:')
+            col.prop(self, 'root_default')
+            
+            col = layout.column()
+            col.label(text='If specified, will be the default root folder path when using export to Zip')
+            col.label(text='Typically the root folder of the current project')
+
+
+
+### --- REGISTER ---
+
+classes=(
+myaddonPrefs,
+)
+
+def register(): 
+    for cls in classes:
+        bpy.utils.register_class(cls)
+
+def unregister():
+    for cls in reversed(classes):
+        bpy.utils.unregister_class(cls)
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