diff --git a/src/permission/Permissible.php b/src/permission/Permissible.php
index 926ecb026..5fca2b14f 100644
--- a/src/permission/Permissible.php
+++ b/src/permission/Permissible.php
@@ -66,7 +66,11 @@ interface Permissible{
 
 	public function removeAttachment(PermissionAttachment $attachment) : void;
 
-	public function recalculatePermissions() : void;
+	/**
+	 * @return bool[] changed permission name => old value
+	 * @phpstan-return array<string, bool>
+	 */
+	public function recalculatePermissions() : array;
 
 	/**
 	 * @return Set|\Closure[]
diff --git a/src/permission/PermissibleBase.php b/src/permission/PermissibleBase.php
index 646d8db11..b65fcf78c 100644
--- a/src/permission/PermissibleBase.php
+++ b/src/permission/PermissibleBase.php
@@ -129,7 +129,7 @@ class PermissibleBase implements Permissible{
 
 	}
 
-	public function recalculatePermissions() : void{
+	public function recalculatePermissions() : array{
 		Timings::$permissibleCalculationTimer->startTiming();
 
 		$permManager = PermissionManager::getInstance();
@@ -179,6 +179,7 @@ class PermissibleBase implements Permissible{
 		});
 
 		Timings::$permissibleCalculationTimer->stopTiming();
+		return $diff;
 	}
 
 	/**
diff --git a/src/permission/PermissibleDelegateTrait.php b/src/permission/PermissibleDelegateTrait.php
index 2988ad160..e38762efe 100644
--- a/src/permission/PermissibleDelegateTrait.php
+++ b/src/permission/PermissibleDelegateTrait.php
@@ -67,8 +67,8 @@ trait PermissibleDelegateTrait{
 		$this->perm->removeAttachment($attachment);
 	}
 
-	public function recalculatePermissions() : void{
-		$this->perm->recalculatePermissions();
+	public function recalculatePermissions() : array{
+		return $this->perm->recalculatePermissions();
 	}
 
 	/**