diff --git a/tweed5-core/src/main/java/de/siphalor/tweed5/core/api/container/ConfigContainer.java b/tweed5-core/src/main/java/de/siphalor/tweed5/core/api/container/ConfigContainer.java
index 8ce372d..c899e20 100644
--- a/tweed5-core/src/main/java/de/siphalor/tweed5/core/api/container/ConfigContainer.java
+++ b/tweed5-core/src/main/java/de/siphalor/tweed5/core/api/container/ConfigContainer.java
@@ -20,6 +20,8 @@ public interface ConfigContainer<T> {
 	@SuppressWarnings("rawtypes")
 	TweedConstructFactory<ConfigContainer> FACTORY = TweedConstructFactory.builder(ConfigContainer.class).build();
 
+	ConfigContainerSetupPhase setupPhase();
+
 	default void registerExtensions(Class<? extends TweedExtension>... extensionClasses) {
 		for (Class<? extends TweedExtension> extensionClass : extensionClasses) {
 			registerExtension(extensionClass);
diff --git a/tweed5-core/src/main/java/de/siphalor/tweed5/core/api/container/ConfigContainerSetupPhase.java b/tweed5-core/src/main/java/de/siphalor/tweed5/core/api/container/ConfigContainerSetupPhase.java
index 01a8991..6b51ca0 100644
--- a/tweed5-core/src/main/java/de/siphalor/tweed5/core/api/container/ConfigContainerSetupPhase.java
+++ b/tweed5-core/src/main/java/de/siphalor/tweed5/core/api/container/ConfigContainerSetupPhase.java
@@ -4,5 +4,5 @@ public enum ConfigContainerSetupPhase {
 	EXTENSIONS_SETUP,
 	TREE_SETUP,
 	TREE_ATTACHED,
-	READY,
+	INITIALIZED,
 }
diff --git a/tweed5-core/src/main/java/de/siphalor/tweed5/core/impl/DefaultConfigContainer.java b/tweed5-core/src/main/java/de/siphalor/tweed5/core/impl/DefaultConfigContainer.java
index f336316..bf24462 100644
--- a/tweed5-core/src/main/java/de/siphalor/tweed5/core/impl/DefaultConfigContainer.java
+++ b/tweed5-core/src/main/java/de/siphalor/tweed5/core/impl/DefaultConfigContainer.java
@@ -201,7 +201,7 @@ public class DefaultConfigContainer<T> implements ConfigContainer<T> {
 		requireSetupPhase(
 				ConfigContainerSetupPhase.TREE_SETUP,
 				ConfigContainerSetupPhase.TREE_ATTACHED,
-				ConfigContainerSetupPhase.READY
+				ConfigContainerSetupPhase.INITIALIZED
 		);
 		try {
 			return Optional.ofNullable(extensions.getSingleInstance(extensionClass));
@@ -215,7 +215,7 @@ public class DefaultConfigContainer<T> implements ConfigContainer<T> {
 		requireSetupPhase(
 				ConfigContainerSetupPhase.TREE_SETUP,
 				ConfigContainerSetupPhase.TREE_ATTACHED,
-				ConfigContainerSetupPhase.READY
+				ConfigContainerSetupPhase.INITIALIZED
 		);
 		return Collections.unmodifiableCollection(extensions.values());
 	}
@@ -246,7 +246,7 @@ public class DefaultConfigContainer<T> implements ConfigContainer<T> {
 		requireSetupPhase(
 				ConfigContainerSetupPhase.TREE_SETUP,
 				ConfigContainerSetupPhase.TREE_ATTACHED,
-				ConfigContainerSetupPhase.READY
+				ConfigContainerSetupPhase.INITIALIZED
 		);
 		return registeredEntryDataExtensions;
 	}
@@ -262,12 +262,12 @@ public class DefaultConfigContainer<T> implements ConfigContainer<T> {
 			}
 		});
 
-		setupPhase = ConfigContainerSetupPhase.READY;
+		setupPhase = ConfigContainerSetupPhase.INITIALIZED;
 	}
 
 	@Override
 	public ConfigEntry<T> rootEntry() {
-		requireSetupPhase(ConfigContainerSetupPhase.TREE_ATTACHED, ConfigContainerSetupPhase.READY);
+		requireSetupPhase(ConfigContainerSetupPhase.TREE_ATTACHED, ConfigContainerSetupPhase.INITIALIZED);
 
 		assert rootEntry != null;
 		return rootEntry;
diff --git a/tweed5-core/src/test/java/de/siphalor/tweed5/core/impl/DefaultConfigContainerTest.java b/tweed5-core/src/test/java/de/siphalor/tweed5/core/impl/DefaultConfigContainerTest.java
index edc5985..5e6bc83 100644
--- a/tweed5-core/src/test/java/de/siphalor/tweed5/core/impl/DefaultConfigContainerTest.java
+++ b/tweed5-core/src/test/java/de/siphalor/tweed5/core/impl/DefaultConfigContainerTest.java
@@ -173,7 +173,7 @@ class DefaultConfigContainerTest {
 
 		assertThat(configContainer.setupPhase()).isEqualTo(ConfigContainerSetupPhase.TREE_ATTACHED);
 		configContainer.initialize();
-		assertThat(configContainer.setupPhase()).isEqualTo(ConfigContainerSetupPhase.READY);
+		assertThat(configContainer.setupPhase()).isEqualTo(ConfigContainerSetupPhase.INITIALIZED);
 
 		var initTracker = configContainer.extension(ExtensionInitTracker.class).orElseThrow();
 		assertThat(initTracker.initializedEntries()).containsExactlyInAnyOrder(compoundEntry, subEntry);