diff --git a/src/ChunkedItemsIterator.php b/src/ChunkedItemsIterator.php
index 55bfe37..80eb087 100644
--- a/src/ChunkedItemsIterator.php
+++ b/src/ChunkedItemsIterator.php
@@ -51,6 +51,8 @@ final class ChunkedItemsIterator
     private ?int $numberOfItems;
 
     /**
+     * @internal Use the static factory methods instead.
+     *
      * @param list<string>|Iterator<string> $items
      * @param positive-int                  $batchSize
      */
diff --git a/src/Configuration.php b/src/Configuration.php
index a2d7963..9835535 100644
--- a/src/Configuration.php
+++ b/src/Configuration.php
@@ -41,6 +41,8 @@ final class Configuration
     private ?int $totalNumberOfBatches;
 
     /**
+     * @internal Use the static factory methods instead.
+     *
      * @param positive-int        $numberOfProcesses
      * @param positive-int        $segmentSize
      * @param positive-int|null   $numberOfSegments
diff --git a/src/Input/ParallelizationInput.php b/src/Input/ParallelizationInput.php
index 0213934..50ff99c 100644
--- a/src/Input/ParallelizationInput.php
+++ b/src/Input/ParallelizationInput.php
@@ -55,6 +55,8 @@ final class ParallelizationInput
     private bool $childProcess;
 
     /**
+     * @internal Use the static factory methods instead.
+     *
      * @param positive-int|callable():positive-int $numberOfOrFindNumberOfProcesses
      */
     public function __construct(