diff --git a/src/RRule.php b/src/RRule.php
index f33a722..02da40c 100755
--- a/src/RRule.php
+++ b/src/RRule.php
@@ -916,6 +916,7 @@ class RRule implements RRuleInterface
 
 	/**
 	 * @internal
+	 * @return bool
 	 */
 	#[\ReturnTypeWillChange]
 	public function offsetExists($offset)
@@ -925,6 +926,7 @@ class RRule implements RRuleInterface
 
 	/**
 	 * @internal
+	 * @return mixed
 	 */
 	#[\ReturnTypeWillChange]
 	public function offsetGet($offset)
@@ -958,6 +960,7 @@ class RRule implements RRuleInterface
 
 	/**
 	 * @internal
+	 * @return void
 	 */
 	#[\ReturnTypeWillChange]
 	public function offsetSet($offset, $value)
@@ -967,6 +970,7 @@ class RRule implements RRuleInterface
 
 	/**
 	 * @internal
+	 * @return void
 	 */
 	#[\ReturnTypeWillChange]
 	public function offsetUnset($offset)
diff --git a/src/RSet.php b/src/RSet.php
index 8a1d4e0..6a21793 100755
--- a/src/RSet.php
+++ b/src/RSet.php
@@ -488,6 +488,7 @@ class RSet implements RRuleInterface
 
 	/**
 	 * @internal
+	 * @return bool
 	 */
 	#[\ReturnTypeWillChange]
 	public function offsetExists($offset)
@@ -497,6 +498,7 @@ class RSet implements RRuleInterface
 
 	/**
 	 * @internal
+	 * @return mixed
 	 */
 	#[\ReturnTypeWillChange]
 	public function offsetGet($offset)
@@ -530,6 +532,7 @@ class RSet implements RRuleInterface
 
 	/**
 	 * @internal
+	 * @return void
 	 */
 	#[\ReturnTypeWillChange]
 	public function offsetSet($offset, $value)
@@ -539,6 +542,7 @@ class RSet implements RRuleInterface
 
 	/**
 	 * @internal
+	 * @return void
 	 */
 	#[\ReturnTypeWillChange]
 	public function offsetUnset($offset)