diff --git a/dispatcher/backend/src/common/schemas/offliners/zimit.py b/dispatcher/backend/src/common/schemas/offliners/zimit.py
index b4fba798..1f5c618d 100644
--- a/dispatcher/backend/src/common/schemas/offliners/zimit.py
+++ b/dispatcher/backend/src/common/schemas/offliners/zimit.py
@@ -1,11 +1,10 @@
-from marshmallow import fields, validate
-
 from common.schemas import SerializableSchema, String, StringEnum
 from common.schemas.fields import (
     validate_output,
     validate_zim_description,
     validate_zim_filename,
 )
+from marshmallow import fields, validate
 
 # https://github.com/puppeteer/puppeteer/blob/main/src/common/DeviceDescriptors.ts
 # https://github.com/puppeteer/puppeteer/blob/
@@ -419,8 +418,9 @@ class Meta:
     disk_utilization = fields.Integer(
         metadata={
             "label": "Disk Utilization",
-            "description": "If set, save state and exit if disk utilization exceeds "
-            "this percentage value. Defaults to 90",
+            "description": "Save state and exit if disk utilization exceeds this "
+            "percentage value. Default (if not set) is 90%. Set to 0 to disable disk "
+            "utilization check.",
         },
         data_key="diskUtilization",
         required=False,