diff --git a/README.MD b/README.MD
index d7e33c0..2b7adeb 100644
--- a/README.MD
+++ b/README.MD
@@ -58,6 +58,8 @@ mongo_db_bundle:
             - { host: host2 }
         username:         ''
         password:         ''
+        authSource:       '' # the database name associated with the user’s credentials, defaults to connection
+                                database_name if not specified
         replicaSet:       '' # default null (no replica) (experimental)
         ssl:              false
         connectTimeoutMS: 3000 # default null (no timeout)
diff --git a/docker-compose.yml b/docker-compose.yml
index 43ecf1d..43068bf 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -13,8 +13,7 @@ services:
     image: mongo:3.4.2
     ports:
       - 27017:27017
-    entrypoint:
-      - mongod
-      - --quiet
-      - --logpath=/dev/null
+    environment:
+      - MONGO_INITDB_ROOT_USERNAME=root
+      - MONGO_INITDB_ROOT_PASSWORD=rootPass
     container_name: mb_mongo
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index d008686..e7a5cfe 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -22,13 +22,13 @@ public function getConfigTreeBuilder()
         $rootNode = $treeBuilder->root('mongo_db_bundle');
         $rootNode
             ->children()
-            ->booleanNode('data_collection')->defaultTrue()->info('Use to disable Data Collection if needed')
+            ->booleanNode('data_collection')->defaultTrue()->info('Disables Data Collection if needed')
             ->end()
             ->arrayNode('clients')->isRequired()->requiresAtLeastOneElement()
                 ->useAttributeAsKey('name')
                 ->prototype('array')
                 ->children()
-                    ->arrayNode('hosts')->info('Your MongoDB hosts addresses and ports')
+                    ->arrayNode('hosts')->info('Hosts addresses and ports')
                         ->prototype('array')
                             ->children()
                                 ->scalarNode('host')->isRequired()->end()
@@ -38,6 +38,7 @@ public function getConfigTreeBuilder()
                     ->end()
                     ->scalarNode('username')->defaultValue('')->end()
                     ->scalarNode('password')->defaultValue('')->end()
+                    ->scalarNode('authSource')->defaultValue(null)->info('Database name associated with the user’s credentials')->end()
                     ->scalarNode('readPreference')
                         ->defaultValue('primaryPreferred')
                         ->validate()
@@ -54,8 +55,8 @@ public function getConfigTreeBuilder()
                 ->useAttributeAsKey('name')
                 ->prototype('array')
                 ->children()
-                    ->scalarNode('client_name')->isRequired()->info('Your defined client name')->end()
-                    ->scalarNode('database_name')->isRequired()->info('Your MongoDB database name')->end()
+                    ->scalarNode('client_name')->isRequired()->info('Desired client name')->end()
+                    ->scalarNode('database_name')->isRequired()->info('Database name')->end()
                 ->end()
             ->end();
 
diff --git a/src/Models/ClientConfiguration.php b/src/Models/ClientConfiguration.php
index d0740a6..69d70aa 100644
--- a/src/Models/ClientConfiguration.php
+++ b/src/Models/ClientConfiguration.php
@@ -16,25 +16,30 @@ final class ClientConfiguration
     private $password;
     /** @var array */
     private $options;
+    /** @var null|string */
+    private $authSource;
 
     /**
      * ClientConfiguration constructor.
      *
-     * @param string $hosts
-     * @param string $username
-     * @param string $password
-     * @param array  $options
+     * @param string      $hosts
+     * @param string      $username
+     * @param string      $password
+     * @param string|null $authSource
+     * @param array       $options
      */
     public function __construct(
         string $hosts,
         string $username = '',
         string $password = '',
+        string $authSource = null,
         array $options = []
     ) {
         $this->hosts = $hosts;
         $this->username = $username;
         $this->password = $password;
         $this->options = $options;
+        $this->authSource = $authSource;
     }
 
     /**
@@ -61,6 +66,14 @@ public function getPassword(): string
         return $this->password;
     }
 
+    /**
+     * @return null|string
+     */
+    public function getAuthSource()
+    {
+        return $this->authSource;
+    }
+
     /**
      * @return array
      */
diff --git a/src/Services/ClientRegistry.php b/src/Services/ClientRegistry.php
index f35a3ec..9bc82cb 100644
--- a/src/Services/ClientRegistry.php
+++ b/src/Services/ClientRegistry.php
@@ -69,11 +69,12 @@ private function buildClientConfiguration(array $conf): ClientConfiguration
             $this->buildConnectionUri($conf['hosts']),
             $conf['username'],
             $conf['password'],
+            $conf['authSource'],
             [
                 'replicaSet' => $conf['replicaSet'],
                 'ssl' => $conf['ssl'],
                 'connectTimeoutMS' => $conf['connectTimeoutMS'],
-                'readPreference' => $conf['readPreference'],
+                'readPreference' => $conf['readPreference']
             ]
         );
     }
@@ -128,7 +129,13 @@ public function getClient(string $name, string $databaseName = null): Client
         if (!isset($this->clients[$clientKey])) {
             $conf = $this->configurations[$name];
             $uri = sprintf('mongodb://%s', $conf->getHosts());
-            $options = array_merge(['database' => $databaseName], $conf->getOptions());
+            $options = array_merge(
+                [
+                    'database' => $databaseName,
+                    'authSource' => $conf->getAuthSource() ?? $databaseName
+                ],
+                $conf->getOptions()
+            );
             $this->clients[$clientKey] = $this->buildClient($name, $uri, $options, []);
 
             $this->eventDispatcher->dispatch(
diff --git a/src/Services/Explain/ExplainQueryService.php b/src/Services/Explain/ExplainQueryService.php
index a2de4c7..5fd61da 100644
--- a/src/Services/Explain/ExplainQueryService.php
+++ b/src/Services/Explain/ExplainQueryService.php
@@ -59,7 +59,7 @@ public function execute(Query $query, string $verbosity = self::VERBOSITY_ALL_PL
             );
         };
 
-        $manager = $this->clientRegistry->getClient($query->getClient())->__debugInfo()['manager'];
+        $manager = $this->clientRegistry->getClient($query->getClient(),$query->getDatabase())->__debugInfo()['manager'];
 
         return $manager
             ->executeCommand(
diff --git a/test.sh b/test.sh
index 4057445..16c7689 100755
--- a/test.sh
+++ b/test.sh
@@ -1,3 +1,4 @@
 #!/usr/bin/env bash
 
+docker-compose start
 docker exec -ti mb_php bin/phpunit -c phpunit.xml.dist
diff --git a/tests/Functional/Capsule/CollectionTest.php b/tests/Functional/Capsule/CollectionTest.php
index 15a2980..ff2f3fa 100644
--- a/tests/Functional/Capsule/CollectionTest.php
+++ b/tests/Functional/Capsule/CollectionTest.php
@@ -14,7 +14,7 @@ private function getManager(): Manager
         /** @var \Facile\MongoDbBundle\Services\ClientRegistry $reg */
         $reg = $this->getContainer()->get('mongo.client_registry');
         /** @var \MongoDB\Client $client */
-        $client = $reg->getClient('test_client');
+        $client = $reg->getClient('test_client', 'testdb');
 
         return $client->__debugInfo()['manager'];
     }
diff --git a/tests/Functional/TestApp/config_test_32_docker.yml b/tests/Functional/TestApp/config_test_32_docker.yml
index 7ffdb7b..49cc209 100644
--- a/tests/Functional/TestApp/config_test_32_docker.yml
+++ b/tests/Functional/TestApp/config_test_32_docker.yml
@@ -6,6 +6,9 @@ framework:
 mongo_db_bundle:
     clients:
       test_client:
+        username: root
+        password: rootPass
+        authSource: admin
         hosts:
           - { host: mongo, port: 27017 }
 
diff --git a/tests/Functional/TestApp/config_test_docker.yml b/tests/Functional/TestApp/config_test_docker.yml
index df4fee1..e39041d 100644
--- a/tests/Functional/TestApp/config_test_docker.yml
+++ b/tests/Functional/TestApp/config_test_docker.yml
@@ -4,6 +4,9 @@ framework:
 mongo_db_bundle:
     clients:
       test_client:
+        username: root
+        password: rootPass
+        authSource: admin
         hosts:
           - { host: mongo, port: 27017 }
 
diff --git a/tests/Unit/DependencyInjection/ConfigurationTest.php b/tests/Unit/DependencyInjection/ConfigurationTest.php
index c364c3c..9e7f3a4 100644
--- a/tests/Unit/DependencyInjection/ConfigurationTest.php
+++ b/tests/Unit/DependencyInjection/ConfigurationTest.php
@@ -36,6 +36,7 @@ public function test_full_configuration_process()
                     ],
                     'username' => 'foo',
                     'password' => 'bar',
+                    'authSource' => null,
                     'replicaSet' => null,
                     'ssl' => false,
                     'connectTimeoutMS' => null,
@@ -65,6 +66,7 @@ public function test_options_configuration_process()
                     ],
                     'username' => 'foo',
                     'password' => 'bar',
+                    'authSource' => null,
                     'replicaSet' => 'testReplica',
                     'ssl' => true,
                     'connectTimeoutMS' => 3000,
@@ -94,6 +96,7 @@ public function test_data_collection_disabled_configuration_process()
                     ],
                     'username' => 'foo',
                     'password' => 'bar',
+                    'authSource' => null,
                     'replicaSet' => 'testReplica',
                     'ssl' => true,
                     'connectTimeoutMS' => 3000,
@@ -123,6 +126,7 @@ public function test_multiple_connections_configuration_process()
                     ],
                     'username' => 'foo',
                     'password' => 'bar',
+                    'authSource' => null,
                     'replicaSet' => null,
                     'ssl' => false,
                     'connectTimeoutMS' => null,
@@ -135,6 +139,7 @@ public function test_multiple_connections_configuration_process()
                     ],
                     'username' => 'mee',
                     'password' => 'zod',
+                    'authSource' => null,
                     'replicaSet' => null,
                     'ssl' => false,
                     'connectTimeoutMS' => null,
diff --git a/tests/Unit/Models/ClientConfigurationTest.php b/tests/Unit/Models/ClientConfigurationTest.php
index db6a1e2..4bf3122 100644
--- a/tests/Unit/Models/ClientConfigurationTest.php
+++ b/tests/Unit/Models/ClientConfigurationTest.php
@@ -61,6 +61,7 @@ public function test_construction_with_options(array $options, array $expectedOp
             'localhost:27017',
             '',
             '',
+            null,
             $options
         );
 
diff --git a/tests/Unit/Services/ClientRegistryTest.php b/tests/Unit/Services/ClientRegistryTest.php
index b681484..f506b5d 100644
--- a/tests/Unit/Services/ClientRegistryTest.php
+++ b/tests/Unit/Services/ClientRegistryTest.php
@@ -22,6 +22,7 @@ public function test_client_connection_url_generation_singlehost()
                 ],
                 'username' => 'foo',
                 'password' => 'bar',
+                'authSource' => null,
                 'replicaSet' => 'testReplica',
                 'ssl' => true,
                 'connectTimeoutMS' => 3000,
@@ -30,11 +31,11 @@ public function test_client_connection_url_generation_singlehost()
         ];
 
         $registry->addClientsConfigurations($testConf);
-        $client = $registry->getClient('test_client');
+        $client = $registry->getClient('test_client', 'testdb');
 
         $this->assertEquals('mongodb://host1:8080',$client->__debugInfo()['uri']);
 
-        $this->assertEquals(['test_client'], $registry->getClientNames());
+        $this->assertEquals(['test_client.testdb'], $registry->getClientNames());
     }
     public function test_client_connection_url_generation_multyhost()
     {
@@ -51,6 +52,7 @@ public function test_client_connection_url_generation_multyhost()
                 ],
                 'username' => 'foo',
                 'password' => 'bar',
+                'authSource' => null,
                 'replicaSet' => 'testReplica',
                 'ssl' => true,
                 'connectTimeoutMS' => 3000,
@@ -59,7 +61,7 @@ public function test_client_connection_url_generation_multyhost()
         ];
 
         $registry->addClientsConfigurations($testConf);
-        $client = $registry->getClient('test_client');
+        $client = $registry->getClient('test_client', 'testdb');
 
         $this->assertEquals('mongodb://host1:8080,host2:8081',$client->__debugInfo()['uri']);
     }