diff --git a/.gitignore b/.gitignore
index 3c1454d..b193961 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@ build/
 test.php
 coverage/
 !coverage/.gitkeep
+prometheus.db
\ No newline at end of file
diff --git a/README.md b/README.md
index 7adb3ad..f8c7f58 100644
--- a/README.md
+++ b/README.md
@@ -251,6 +251,8 @@ Using SQLite with memory database is same as using InMemory Database.
 ```php
 use Rancoud\Database\Configurator;
 use Rancoud\Database\Database;
+use Rancoud\Prometheus\Counter;
+use Rancoud\Prometheus\Descriptor;
 use Rancoud\Prometheus\Storage\SQLite;
 
 $params = [
@@ -265,12 +267,12 @@ $configurator = new Configurator($params);
 
 $database = new Database($configurator);
 
-$storage = new Rancoud\Prometheus\SQLite($database);
+$storage = new SQLite($database);
 
 $counter = new Counter($storage, new Descriptor("example"));
 ```
 
-## Metric
+## Collector (metric)
 Constructor
 ```php
 public function __construct(Adapter $storage, Descriptor $descriptor)
@@ -460,7 +462,7 @@ Returns the default Registry (singleton).
 public static function getDefault(): self
 ```
 
-## Storage
+## Storage (Adapter interface)
 Returns metrics (counter, gauge, histogram and summary) as iterable.  
 If metric type and name is provided it will return only the specify metric.
 ```php
@@ -524,6 +526,37 @@ Returns text of summaries metric as iterable.
 public function exposeSummaries(string $metricName = ''): iterable
 ```
 
+### SQLite
+Returns text of counters metric as iterable.
+```php
+public function exposeCounters(string $metricName = ''): iterable
+```
+
+Returns text of gauges metric as iterable.
+```php
+public function exposeGauges(string $metricName = ''): iterable
+```
+
+Returns text of histograms metric as iterable.
+```php
+public function exposeHistograms(string $metricName = ''): iterable
+```
+
+Returns text of summaries metric as iterable.
+```php
+public function exposeSummaries(string $metricName = ''): iterable
+```
+
+Remove all expired summaries sample according to the TTL.
+```php
+public function deleteExpiredSummaries(): void
+```
+
+Drop all tables.
+```php
+public function deleteStorage(): void
+```
+
 ## How to Dev
 `composer ci` for php-cs-fixer and phpunit and coverage  
 `composer lint` for php-cs-fixer  
diff --git a/src/Storage/SQLite.php b/src/Storage/SQLite.php
index 31e04e1..f68082e 100644
--- a/src/Storage/SQLite.php
+++ b/src/Storage/SQLite.php
@@ -742,7 +742,11 @@ protected function updateMetadata(Descriptor $descriptor, string $metricType): v
         ]);
     }
 
-    /** @throws DatabaseException */
+    /**
+     * Remove all expired summaries sample according to the TTL.
+     *
+     * @throws DatabaseException
+     */
     public function deleteExpiredSummaries(): void
     {
         $sql = <<<SQL
@@ -782,7 +786,11 @@ public function wipeStorage(): void
         $this->database->truncateTables(...$tables);
     }
 
-    /** @throws DatabaseException */
+    /**
+     * Drop all tables.
+     *
+     * @throws DatabaseException
+     */
     public function deleteStorage(): void
     {
         $tables = [