diff --git a/src/Admin/AbstractAdmin.php b/src/Admin/AbstractAdmin.php
index 9a8fd654c8c..5772399e3a7 100644
--- a/src/Admin/AbstractAdmin.php
+++ b/src/Admin/AbstractAdmin.php
@@ -1749,6 +1749,8 @@ public function isCurrentChild(): bool
 
     /**
      * Returns the current child admin instance.
+     *
+     * @return AdminInterface|null the current child admin instance
      */
     public function getCurrentChildAdmin(): ?AdminInterface
     {
diff --git a/src/Admin/AdminInterface.php b/src/Admin/AdminInterface.php
index 98c568e6fcd..db61a3f3176 100644
--- a/src/Admin/AdminInterface.php
+++ b/src/Admin/AdminInterface.php
@@ -135,6 +135,9 @@ public function getSecurityInformation(): array;
 
     public function setParentFieldDescription(FieldDescriptionInterface $parentFieldDescription): void;
 
+    /**
+     * @throws \LogicException
+     */
     public function getParentFieldDescription(): FieldDescriptionInterface;
 
     /**
diff --git a/src/Mapper/BaseMapper.php b/src/Mapper/BaseMapper.php
index 88f1b5303e2..b00020ec98e 100644
--- a/src/Mapper/BaseMapper.php
+++ b/src/Mapper/BaseMapper.php
@@ -51,7 +51,10 @@ abstract public function get(string $key);
 
     abstract public function has(string $key): bool;
 
-    abstract public function remove(string $key): self;
+    /**
+     * @return static
+     */
+    abstract public function remove(string $key);
 
     /**
      * Returns configured keys.
@@ -62,6 +65,8 @@ abstract public function keys(): array;
 
     /**
      * @param string[] $keys field names
+     *
+     * @return static
      */
-    abstract public function reorder(array $keys): self;
+    abstract public function reorder(array $keys);
 }
diff --git a/src/Show/ShowMapper.php b/src/Show/ShowMapper.php
index 7a3d4d08b4e..f8d40acdb1c 100644
--- a/src/Show/ShowMapper.php
+++ b/src/Show/ShowMapper.php
@@ -18,7 +18,6 @@
 use Sonata\AdminBundle\Admin\FieldDescriptionInterface;
 use Sonata\AdminBundle\Builder\ShowBuilderInterface;
 use Sonata\AdminBundle\Mapper\BaseGroupedMapper;
-use Sonata\AdminBundle\Mapper\BaseMapper;
 
 /**
  * This class is used to simulate the Form API.
@@ -107,7 +106,7 @@ public function has(string $key): bool
         return $this->list->has($key);
     }
 
-    public function remove(string $key): BaseMapper
+    public function remove(string $key): self
     {
         $this->admin->removeShowFieldDescription($key);
         $this->list->remove($key);
@@ -160,7 +159,7 @@ final public function keys(): array
         return array_keys($this->list->getElements());
     }
 
-    public function reorder(array $keys): BaseMapper
+    public function reorder(array $keys): self
     {
         $this->admin->reorderShowGroup($this->getCurrentGroupName(), $keys);