diff --git a/src/Symfony/ParameterDefinition.php b/src/Symfony/ParameterDefinition.php
index e1aa2ea..1da7723 100644
--- a/src/Symfony/ParameterDefinition.php
+++ b/src/Symfony/ParameterDefinition.php
@@ -2,6 +2,9 @@
 
 namespace PHPStan\Symfony;
 
+/**
+ * @api
+ */
 interface ParameterDefinition
 {
 
diff --git a/src/Symfony/ParameterMap.php b/src/Symfony/ParameterMap.php
index ff0f522..0c55163 100644
--- a/src/Symfony/ParameterMap.php
+++ b/src/Symfony/ParameterMap.php
@@ -5,6 +5,9 @@
 use PhpParser\Node\Expr;
 use PHPStan\Analyser\Scope;
 
+/**
+ * @api
+ */
 interface ParameterMap
 {
 
diff --git a/src/Symfony/ServiceDefinition.php b/src/Symfony/ServiceDefinition.php
index c7cdcd1..6df34cb 100644
--- a/src/Symfony/ServiceDefinition.php
+++ b/src/Symfony/ServiceDefinition.php
@@ -2,6 +2,9 @@
 
 namespace PHPStan\Symfony;
 
+/**
+ * @api
+ */
 interface ServiceDefinition
 {
 
diff --git a/src/Symfony/ServiceMap.php b/src/Symfony/ServiceMap.php
index 6665ede..bbd2d8a 100644
--- a/src/Symfony/ServiceMap.php
+++ b/src/Symfony/ServiceMap.php
@@ -5,6 +5,9 @@
 use PhpParser\Node\Expr;
 use PHPStan\Analyser\Scope;
 
+/**
+ * @api
+ */
 interface ServiceMap
 {