diff --git a/README.md b/README.md
index 0b35f82..8426ad3 100644
--- a/README.md
+++ b/README.md
@@ -16,9 +16,19 @@ Using the database driver for laravel notifications is great, but then you need
 6. Open your App/Console/Kernel.php and in the scheduler define how often you would like the digest process to run. E.g. ```$schedule->command('digestif:pour')->hourly();``` Alternatively, setup your own cron process to run ```php artisan digestif:pour``` when you would like emails to be sent.
 7. Sit back and let Digestif handle the rest 🥃
 
-## Customisation options
+## Config options
 Using the vendor:publish method you have full control of both the notification that we use behind the scenes. You can find this in your App/Notifications folder and you're welcome to tweak this to something that works better for you. 
 
+For example:
+
+| Config Variable | Default | Description
+|---|---|---|
+| enabled | true (boolean) | Should Digestif run or not? |
+| type | simple (string) | What variety of email should it send. Only one option at the moment |
+| user_model | User::class  | What model is used for users that should receive the digest email |
+| notifications_user_id_column | notifiable_id (string) | What column on the notifications table stores the user_id |
+| read_column | read_at | What column from the notifications table stores whether the notification has been read or not |
+
 
 ## Roadmap
 - [x] ~~Simple digest email~~ 
@@ -26,3 +36,38 @@ Using the vendor:publish method you have full control of both the notification t
 - [ ] Unsubscribing from the digest email
 - [ ] Itemised digest emails as well as our simple counter version
 - [ ] User controls to set the frequency of their digests 
+
+
+## Upgrade Guide
+
+### To v0.20 from v0.10
+
+Add the following to your digestif.php config file: 
+
+``` 
+    /*
+    |--------------------------------------------------------------------------
+    | Notifications read column
+    |--------------------------------------------------------------------------
+    |
+    | Please tell us what column stores the read toggle for notifications
+    |
+    */
+    'read_column' => 'read_at',
+```
+
+### To v0.10 from v0.0.2
+
+Add the following to your digestif.php config file
+
+```composer log
+    /*
+    |--------------------------------------------------------------------------
+    | Notifications table user ID column
+    |--------------------------------------------------------------------------
+    |
+    | Please tell us what column stores the user_id used for notifications
+    |
+    */
+    'notifications_user_id_column' => 'notifiable_id',
+```
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 778891b..b215d9a 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "codepotatoltd/digestif",
     "description": "A digest email for Laravel database notifications",
-    "version": "0.1.0",
+    "version": "0.2.0",
     "type": "library",
     "require": {
         "php": ">=7.4",
diff --git a/src/Tasks/Digestable.php b/src/Tasks/Digestable.php
index eca9403..e25ceb9 100644
--- a/src/Tasks/Digestable.php
+++ b/src/Tasks/Digestable.php
@@ -40,8 +40,9 @@ public function run()
         $user_column = \config('digestif.notifications_user_id_column', 'notifiable_id');
 
         DB::table('notifications')
-            ->orderBy('id', 'asc')
+            ->orderBy('id')
             ->select('*')
+            ->where( \config('digestif.read_column'), '=', null)
             ->where('digested_at', '=', null)
             ->chunk(100, function ($notifications) use ($user_column) {
 
diff --git a/src/config/digestif.php b/src/config/digestif.php
index 22c7060..12b9675 100644
--- a/src/config/digestif.php
+++ b/src/config/digestif.php
@@ -44,4 +44,15 @@
     */
     'notifications_user_id_column' => 'notifiable_id',
 
+
+    /*
+    |--------------------------------------------------------------------------
+    | Notifications read column
+    |--------------------------------------------------------------------------
+    |
+    | Please tell us what column stores the read toggle for notifications
+    |
+    */
+    'read_column' => 'read_at',
+
 ];
\ No newline at end of file