diff --git a/edelta.parent/edelta.lib.tests/src/edelta/lib/tests/EdeltaLibraryTest.java b/edelta.parent/edelta.lib.tests/src/edelta/lib/tests/EdeltaLibraryTest.java
index 247bcccb8..e1c0761c1 100644
--- a/edelta.parent/edelta.lib.tests/src/edelta/lib/tests/EdeltaLibraryTest.java
+++ b/edelta.parent/edelta.lib.tests/src/edelta/lib/tests/EdeltaLibraryTest.java
@@ -109,6 +109,15 @@ public void testNewEEnumLiteralWithInitializer() {
 		assertEquals("changed", e.getName());
 	}
 
+	@Test
+	public void test_addEClass() {
+		EPackage ePackage = ecoreFactory.createEPackage();
+		EClass eClass = ecoreFactory.createEClass();
+		lib.addEClass(ePackage, eClass);
+		assertSame(eClass,
+				ePackage.getEClassifiers().get(0));
+	}
+
 	@Test
 	public void test_addNewEClass() {
 		EPackage ePackage = ecoreFactory.createEPackage();
@@ -128,6 +137,15 @@ public void test_addNewEClassWithInitializer() {
 				ePackage.getEClassifiers().get(0));
 	}
 
+	@Test
+	public void test_addEAttribute() {
+		EClass eClass = ecoreFactory.createEClass();
+		EAttribute eAttribute = ecoreFactory.createEAttribute();
+		lib.addEAttribute(eClass, eAttribute);
+		assertSame(eAttribute,
+				eClass.getEStructuralFeatures().get(0));
+	}
+
 	@Test
 	public void test_addNewEAttribute() {
 		EClass eClass = ecoreFactory.createEClass();
diff --git a/edelta.parent/edelta.lib/src/edelta/lib/EdeltaLibrary.java b/edelta.parent/edelta.lib/src/edelta/lib/EdeltaLibrary.java
index b03156577..8e4088c71 100644
--- a/edelta.parent/edelta.lib/src/edelta/lib/EdeltaLibrary.java
+++ b/edelta.parent/edelta.lib/src/edelta/lib/EdeltaLibrary.java
@@ -115,23 +115,31 @@ public String getEObjectRepr(EObject e) {
 		return e.eContainer() != null ? getEObjectRepr(e.eContainer()) + ":" + info : info;
 	}
 
+	public void addEClass(EPackage ePackage, EClass eClass) {
+		ePackage.getEClassifiers().add(eClass);
+	}
+
 	public EClass addNewEClass(EPackage ePackage, String name) {
 		return addNewEClass(ePackage, name, null);
 	}
 
 	public EClass addNewEClass(EPackage ePackage, String name, Consumer<EClass> initializer) {
 		EClass newEClass = newEClass(name, initializer);
-		ePackage.getEClassifiers().add(newEClass);
+		addEClass(ePackage, newEClass);
 		return newEClass;
 	}
 
+	public void addEAttribute(EClass eClass, EAttribute eAttribute) {
+		eClass.getEStructuralFeatures().add(eAttribute);
+	}
+
 	public EAttribute addNewEAttribute(EClass eClass, String name, EDataType dataType) {
 		return addNewEAttribute(eClass, name, dataType, null);
 	}
 
 	public EAttribute addNewEAttribute(EClass eClass, String name, EDataType dataType, Consumer<EAttribute> initializer) {
 		EAttribute eAttribute = newEAttribute(name, dataType, initializer);
-		eClass.getEStructuralFeatures().add(eAttribute);
+		addEAttribute(eClass, eAttribute);
 		return eAttribute;
 	}