diff --git a/src/ApiResource/PartDBInfo.php b/src/ApiResource/PartDBInfo.php
index 5fb2951d..9a06f262 100644
--- a/src/ApiResource/PartDBInfo.php
+++ b/src/ApiResource/PartDBInfo.php
@@ -35,7 +35,7 @@ use App\State\PartDBInfoProvider;
 #[ApiResource(
     uriTemplate: '/info.{_format}',
     description: 'Basic information about Part-DB like version, title, etc.',
-    operations: [new Get()],
+    operations: [new Get(openapiContext: ['summary' => 'Get basic information about the installed Part-DB instance.'])],
     provider: PartDBInfoProvider::class
 )]
 #[ApiFilter(PropertyFilter::class)]
diff --git a/src/Entity/Base/AbstractCompany.php b/src/Entity/Base/AbstractCompany.php
index ae0f47c6..b552d705 100644
--- a/src/Entity/Base/AbstractCompany.php
+++ b/src/Entity/Base/AbstractCompany.php
@@ -40,6 +40,11 @@ use Symfony\Component\Validator\Constraints as Assert;
 #[ORM\MappedSuperclass]
 abstract class AbstractCompany extends AbstractPartsContainingDBElement
 {
+    #[Groups(['company:read'])]
+    protected ?\DateTimeInterface $addedDate = null;
+    #[Groups(['company:read'])]
+    protected ?\DateTimeInterface $lastModified = null;
+
     /**
      * @var string The address of the company
      */
diff --git a/src/Entity/Base/AbstractStructuralDBElement.php b/src/Entity/Base/AbstractStructuralDBElement.php
index 5c4103d8..59d374c8 100644
--- a/src/Entity/Base/AbstractStructuralDBElement.php
+++ b/src/Entity/Base/AbstractStructuralDBElement.php
@@ -22,6 +22,7 @@ declare(strict_types=1);
 
 namespace App\Entity\Base;
 
+use ApiPlatform\Metadata\ApiProperty;
 use App\Entity\Attachments\Attachment;
 use App\Entity\Parameters\AbstractParameter;
 use App\Repository\StructuralDBElementRepository;
@@ -31,6 +32,7 @@ use Doctrine\DBAL\Types\Types;
 use App\Entity\Attachments\AttachmentContainingDBElement;
 use App\Entity\Parameters\ParametersTrait;
 use App\Validator\Constraints\NoneOfItsChildren;
+use Symfony\Component\Serializer\Annotation\SerializedName;
 use Symfony\Component\Validator\Constraints as Assert;
 use Symfony\Component\Validator\Constraints\Valid;
 use function count;
@@ -261,6 +263,8 @@ abstract class AbstractStructuralDBElement extends AttachmentContainingDBElement
      *
      * @return string the full path (incl. the name of this element), delimited by $delimiter
      */
+    #[Groups(['api:basic:read'])]
+    #[SerializedName('full_path')]
     public function getFullPath(string $delimiter = self::PATH_DELIMITER_ARROW): string
     {
         if ($this->full_path_strings === []) {
diff --git a/src/Entity/Parts/Manufacturer.php b/src/Entity/Parts/Manufacturer.php
index 70ea1b6a..b83024ef 100644
--- a/src/Entity/Parts/Manufacturer.php
+++ b/src/Entity/Parts/Manufacturer.php
@@ -22,10 +22,12 @@ declare(strict_types=1);
 
 namespace App\Entity\Parts;
 
+use ApiPlatform\Metadata\ApiFilter;
 use ApiPlatform\Metadata\ApiProperty;
 use ApiPlatform\Metadata\ApiResource;
 use ApiPlatform\Metadata\GetCollection;
 use ApiPlatform\Metadata\Link;
+use ApiPlatform\Serializer\Filter\PropertyFilter;
 use App\Entity\Attachments\Attachment;
 use App\Entity\Attachments\AttachmentTypeAttachment;
 use App\Repository\Parts\ManufacturerRepository;
@@ -49,17 +51,18 @@ use Symfony\Component\Validator\Constraints as Assert;
 #[ORM\Index(name: 'manufacturer_name', columns: ['name'])]
 #[ORM\Index(name: 'manufacturer_idx_parent_name', columns: ['parent_id', 'name'])]
 #[ApiResource(
-    normalizationContext: ['groups' => ['manufacturer:read', 'company:read', 'api:basic:read']],
-    denormalizationContext: ['groups' => ['manufacturer:write', 'company:write', 'api:basic:write']],
+    normalizationContext: ['groups' => ['manufacturer:read', 'company:read', 'api:basic:read'], 'openapi_definition_name' => 'Read'],
+    denormalizationContext: ['groups' => ['manufacturer:write', 'company:write', 'api:basic:write'], 'openapi_definition_name' => 'Write'],
 )]
 #[ApiResource(
     uriTemplate: '/manufacturers/{id}/children.{_format}',
-    operations: [new GetCollection()],
+    operations: [new GetCollection(openapiContext: ['summary' => 'Retrieves the children elements of a manufacturer.'])],
     uriVariables: [
         'id' => new Link(fromClass: Manufacturer::class, fromProperty: 'children')
     ],
-    normalizationContext: ['groups' => ['manufacturer:read', 'company:read', 'api:basic:read']]
+    normalizationContext: ['groups' => ['manufacturer:read', 'company:read', 'api:basic:read'], 'openapi_definition_name' => 'Read']
 )]
+#[ApiFilter(PropertyFilter::class)]
 class Manufacturer extends AbstractCompany
 {
     #[ORM\ManyToOne(targetEntity: self::class, inversedBy: 'children')]
diff --git a/src/Entity/UserSystem/User.php b/src/Entity/UserSystem/User.php
index 6a778e51..7bd22924 100644
--- a/src/Entity/UserSystem/User.php
+++ b/src/Entity/UserSystem/User.php
@@ -83,10 +83,10 @@ use Jbtronics\TFAWebauthn\Model\TwoFactorInterface as WebauthnTwoFactorInterface
 #[ApiResource(
     shortName: 'User',
     operations: [
-        new Get(),
-        new GetCollection(),
+        new Get(openapiContext: ['summary' => 'Get a specific user.']),
+        new GetCollection(openapiContext: ['summary' => 'Get all users defined in the system.']),
     ],
-    normalizationContext: ['groups' => ['user:read']],
+    normalizationContext: ['groups' => ['user:read'], 'openapi_definition_name' => 'Read'],
 )]
 #[ApiFilter(PropertyFilter::class)]
 #[ApiFilter(SearchFilter::class, properties: ['name' => 'exact', 'email' => 'exact'])]