diff --git a/src/Contract/Collection.php b/src/Contract/Collection.php
index 7757e40fa..c1679f0af 100644
--- a/src/Contract/Collection.php
+++ b/src/Contract/Collection.php
@@ -150,6 +150,7 @@
  * @template-extends Hasable<TKey, T>
  * @template-extends Headable<TKey, T>
  * @template-extends IfThenElseable<TKey, T>
+ * @template-extends Implodeable<TKey, T>
  * @template-extends Initable<TKey, T>
  * @template-extends Initsable<TKey, T>
  * @template-extends Intersectable<TKey, T>
diff --git a/src/Contract/Operation/Containsable.php b/src/Contract/Operation/Containsable.php
index 55a71be14..eb66821f9 100644
--- a/src/Contract/Operation/Containsable.php
+++ b/src/Contract/Operation/Containsable.php
@@ -7,6 +7,8 @@
 use loophp\collection\Contract\Collection;
 
 /**
+ * @psalm-template TKey
+ * @psalm-template TKey of array-key
  * @psalm-template T
  */
 interface Containsable