diff --git a/src/Contract/Operation/Chunkable.php b/src/Contract/Operation/Chunkable.php
index 84fe7c104..94a9a1ae5 100644
--- a/src/Contract/Operation/Chunkable.php
+++ b/src/Contract/Operation/Chunkable.php
@@ -14,7 +14,7 @@ interface Chunkable
     /**
      * Chunk the collection into chunks of the given size.
      *
-     * @param array<int, int> $size
+     * @param int ...$size
      *
      * @return \loophp\collection\Base<mixed>|\loophp\collection\Contract\Collection<mixed>
      */
diff --git a/src/Contract/Operation/Mergeable.php b/src/Contract/Operation/Mergeable.php
index 623a6b17c..a9fb0b516 100644
--- a/src/Contract/Operation/Mergeable.php
+++ b/src/Contract/Operation/Mergeable.php
@@ -14,7 +14,7 @@ interface Mergeable
     /**
      * Merge one or more collection of items onto a collection.
      *
-     * @param iterable ...$sources
+     * @param iterable<mixed> ...$sources
      *
      * @return \loophp\collection\Base<mixed>|\loophp\collection\Contract\Collection<mixed>
      */
diff --git a/src/Contract/Operation/Productable.php b/src/Contract/Operation/Productable.php
index 02847f108..e84210bc8 100644
--- a/src/Contract/Operation/Productable.php
+++ b/src/Contract/Operation/Productable.php
@@ -14,7 +14,7 @@ interface Productable
     /**
      * Get the the cartesian product of items of a collection.
      *
-     * @param iterable ...$iterables
+     * @param iterable<mixed> ...$iterables
      *
      * @return \loophp\collection\Base<mixed>|\loophp\collection\Contract\Collection<mixed>
      */
diff --git a/src/Contract/Operation/Zipable.php b/src/Contract/Operation/Zipable.php
index 27e4e3900..a6ac67b67 100644
--- a/src/Contract/Operation/Zipable.php
+++ b/src/Contract/Operation/Zipable.php
@@ -14,7 +14,7 @@ interface Zipable
     /**
      * Zip a collection together with one or more iterables.
      *
-     * @param iterable ...$iterables
+     * @param iterable<mixed> ...$iterables
      *
      * @return \loophp\collection\Base<mixed>|\loophp\collection\Contract\Collection<mixed>
      */
diff --git a/src/Operation/Chunk.php b/src/Operation/Chunk.php
index 93624fd11..976585b85 100644
--- a/src/Operation/Chunk.php
+++ b/src/Operation/Chunk.php
@@ -25,7 +25,7 @@ final class Chunk implements Operation
     /**
      * Chunk constructor.
      *
-     * @param array<int, int> $size
+     * @param int ...$size
      */
     public function __construct(int ...$size)
     {
diff --git a/src/Operation/Merge.php b/src/Operation/Merge.php
index 8aa9b3b6d..706037eef 100644
--- a/src/Operation/Merge.php
+++ b/src/Operation/Merge.php
@@ -14,14 +14,14 @@
 final class Merge implements Operation
 {
     /**
-     * @var iterable[]
+     * @var array<int, iterable<mixed>>
      */
     private $sources;
 
     /**
      * Merge constructor.
      *
-     * @param iterable ...$sources
+     * @param iterable<mixed> ...$sources
      */
     public function __construct(iterable ...$sources)
     {
diff --git a/src/Operation/Product.php b/src/Operation/Product.php
index 36209d3df..880b98834 100644
--- a/src/Operation/Product.php
+++ b/src/Operation/Product.php
@@ -17,14 +17,14 @@
 final class Product implements Operation
 {
     /**
-     * @var iterable[]
+     * @var array<int, iterable<mixed>>
      */
     private $iterables;
 
     /**
      * Product constructor.
      *
-     * @param iterable ...$iterables
+     * @param iterable<mixed> ...$iterables
      */
     public function __construct(iterable ...$iterables)
     {
diff --git a/src/Operation/Window.php b/src/Operation/Window.php
index 7fd8a0cbf..b1c405b18 100644
--- a/src/Operation/Window.php
+++ b/src/Operation/Window.php
@@ -24,7 +24,7 @@ final class Window implements Operation
     /**
      * Window constructor.
      *
-     * @param array<int, int> $length
+     * @param int ...$length
      */
     public function __construct(int ...$length)
     {
diff --git a/src/Operation/Zip.php b/src/Operation/Zip.php
index 8363378fe..cd9298fde 100644
--- a/src/Operation/Zip.php
+++ b/src/Operation/Zip.php
@@ -23,7 +23,7 @@ final class Zip implements Operation
     /**
      * Zip constructor.
      *
-     * @param iterable ...$iterables
+     * @param iterable<mixed> ...$iterables
      */
     public function __construct(iterable ...$iterables)
     {