diff --git a/UPGRADING.md b/UPGRADING.md
index 8dafd844e..d25d8c893 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -165,6 +165,7 @@
  - [BC] Property `Psalm\Config::$allow_phpstorm_generics` was removed
  - [BC] Property `Psalm\Config::$exit_functions` was removed
  - [BC] Property `Psalm\Config::$forbid_echo` was removed
+ - [BC] Property `Psalm\Config::$load_xdebug_stub` was removed
  - [BC] Method `Psalm\Type::getEmpty()` was removed
  - [BC] Legacy hook interfaces have been removed:
    -  `Psalm\Plugin\Hook\MethodReturnTypeProviderInterface`