diff --git a/UPGRADING.md b/UPGRADING.md
index a389e609676..070a7f54607 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -131,6 +131,7 @@
  - [BC] Method `Psalm\Type\Union::isEmpty()` was removed
  - [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] Method `Psalm\Type::getEmpty()` was removed
  - [BC] Legacy hook interfaces have been removed:
    -  `Psalm\Plugin\Hook\MethodReturnTypeProviderInterface`