diff --git a/dataforge-meta/api/dataforge-meta.api b/dataforge-meta/api/dataforge-meta.api
index a3c45b6a..c1f68f89 100644
--- a/dataforge-meta/api/dataforge-meta.api
+++ b/dataforge-meta/api/dataforge-meta.api
@@ -496,8 +496,8 @@ public final class hep/dataforge/meta/SpecificationKt {
 	public static final fun spec (Lhep/dataforge/meta/MutableItemProvider;Lhep/dataforge/meta/Specification;Lhep/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun spec$default (Lhep/dataforge/meta/MutableItemProvider;Lhep/dataforge/meta/Specification;Lhep/dataforge/meta/Scheme;Lhep/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun spec$default (Lhep/dataforge/meta/MutableItemProvider;Lhep/dataforge/meta/Specification;Lhep/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun update (Lhep/dataforge/meta/Config;Lhep/dataforge/meta/Specification;Lkotlin/jvm/functions/Function1;)Lhep/dataforge/meta/MutableItemProvider;
 	public static final fun update (Lhep/dataforge/meta/Configurable;Lhep/dataforge/meta/Specification;Lkotlin/jvm/functions/Function1;)Lhep/dataforge/meta/Configurable;
+	public static final fun update (Lhep/dataforge/meta/MutableItemProvider;Lhep/dataforge/meta/Specification;Lkotlin/jvm/functions/Function1;)Lhep/dataforge/meta/MutableItemProvider;
 	public static final fun withSpec (Lhep/dataforge/meta/TypedMetaItem;Lhep/dataforge/meta/Specification;)Lhep/dataforge/meta/MutableItemProvider;
 }
 
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Specification.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Specification.kt
index d6bd4579..b15ef355 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Specification.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Specification.kt
@@ -33,9 +33,9 @@ public interface Specification<T : MutableItemProvider> {
 }
 
 /**
- * Update a [Config] using given specification
+ * Update a [MutableItemProvider] using given specification
  */
-public fun <T : MutableItemProvider> Config.update(spec: Specification<T>, action: T.() -> Unit): T =
+public fun <T : MutableItemProvider> MutableItemProvider.update(spec: Specification<T>, action: T.() -> Unit): T =
     spec.write(this).apply(action)
 
 /**