diff --git a/src/Exception/Exception.php b/src/Exception/Exception.php
new file mode 100644
index 0000000..dd8d190
--- /dev/null
+++ b/src/Exception/Exception.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PetrKnap\Optional\Exception;
+
+use Throwable;
+
+/**
+ * @internal root exception
+ */
+interface Exception extends Throwable
+{
+}
diff --git a/src/Exception/OptionalException.php b/src/Exception/OptionalException.php
index d37b61c..39fb045 100644
--- a/src/Exception/OptionalException.php
+++ b/src/Exception/OptionalException.php
@@ -4,8 +4,6 @@
 
 namespace PetrKnap\Optional\Exception;
 
-use Throwable;
-
-interface OptionalException extends Throwable
+interface OptionalException extends Exception
 {
 }
diff --git a/src/Exception/TypedOptionalException.php b/src/Exception/TypedOptionalException.php
index fb0912b..6aa7917 100644
--- a/src/Exception/TypedOptionalException.php
+++ b/src/Exception/TypedOptionalException.php
@@ -4,6 +4,9 @@
 
 namespace PetrKnap\Optional\Exception;
 
+/**
+ * @todo do extend {@see Exception}, not {@see OptionalException}
+ */
 interface TypedOptionalException extends OptionalException
 {
 }