diff --git a/docs/advanced_usage.md b/docs/advanced_usage.md
index fa65b0e..7b65ad4 100644
--- a/docs/advanced_usage.md
+++ b/docs/advanced_usage.md
@@ -27,4 +27,12 @@ $userRepository->findBy(['name' => 'John']); // Will retrieve all users with the
 $userRepository->findBy(['name' => 'John'], ['age' => 'ASC']); // Will retrieve all users with the name 'John' sorted by age in ascending order
 $userRepository->findBy(['name' => 'John'], ['age' => 'ASC'], 5); // Will retrieve 5 users with the name 'John' sorted by age in ascending order
 $userRepository->count(['name' => 'John']); // Will retrieve an integer representing the number of users with the name 'John'
-```
\ No newline at end of file
+```
+
+## Repository
+
+You can create your own repository to query your objects in Redis. Then inject it in the
+`#[RedisOm\Entity(repository: YourCustomRepository::class)]` attribute to use it.
+
+Then in each custom repository you can add custom methods to query your objects in Redis.
+
diff --git a/docs/installation.md b/docs/installation.md
index e69de29..9f64896 100644
--- a/docs/installation.md
+++ b/docs/installation.md
@@ -0,0 +1,34 @@
+# Installation
+
+### PHP
+To use the library you need a php-version >= 8.2 and the Redis extension installed.
+If you don't have the Redis extension installed, you can use your favorite Redis client (for example Predis),
+and create a new class that implements the `RedisClientInterface` interface, then inject it directly in the `#[RedisOm\Entity(client: YourRedisClient::class)]` attribute.
+
+
+### Redis
+You need a Redis server with a version >= 4.0. If you want to use the [JSON](https://redis.io/docs/latest/develop/data-types/json/) data type 
+you need a Redis server with the JSON module installed. By default, the library uses the HASH format type to store objects in Redis, which does not need any module.
+But for indexing our objects and create the schema, you will need the [Redisearch](https://redis.io/search/) module installed.
+
+We recommend using the [Redis stack](https://redis.io/about/about-stack/) to get all modules you need.
+
+### Composer
+
+Install the library by running the following command:
+
+```console
+composer require talleu/php-redis-om
+```
+
+Or add the library to your `composer.json` file:
+
+```json
+{
+    "require": {
+        "talleu/php-redis-om": "*"
+    }
+}
+```
+
+Then run `composer update` to install the library.
\ No newline at end of file
diff --git a/docs/mapping.md b/docs/mapping.md
index ce010ac..8058b5b 100644
--- a/docs/mapping.md
+++ b/docs/mapping.md
@@ -3,7 +3,7 @@
 
 ## Mapping object
 
-You can customize the mapping configuration by adding parameters to you RedisOm\Entity attribute.
+Customize the mapping configuration by adding parameters to you RedisOm\Entity attribute.
 
 ```php
 <?php 
@@ -70,6 +70,15 @@ Each of these parameters are optional and can be omitted. Here is a description
     - Note: The redis client must implement the `RedisClientInterface` interface, it could be a php-redis client 
 or any other client that implements the interface.
 
+You could alternate from JSON format to HASH format in each entity by setting the format parameter to `RedisFormat::HASH->value` or `RedisFormat::JSON->value`.
+But be careful, if you switch the format in an entity that already has data stored in Redis, you will lose all the index stored in the previous format.
+
+Dont forget to run the migration command after changing the format of an entity.
+
+```console
+vendor/bin/redisMigration <YOUR DIRECTORY PATH>
+```
+
 
 ## Mapping properties
 ```php
diff --git a/src/Om/Mapping/Entity.php b/src/Om/Mapping/Entity.php
index 96b99cb..5917071 100644
--- a/src/Om/Mapping/Entity.php
+++ b/src/Om/Mapping/Entity.php
@@ -23,7 +23,6 @@ final class Entity
 {
     public function __construct(
         public ?string               $prefix = null,
-        public ?int                  $expires = null,
         public ?string               $format = null,
         public ?PersisterInterface   $persister = null,
         public ?ConverterInterface   $converter = null,