diff --git a/owlapy/abstracts/__init__.py b/owlapy/abstracts/__init__.py
new file mode 100644
index 0000000..473f64d
--- /dev/null
+++ b/owlapy/abstracts/__init__.py
@@ -0,0 +1,4 @@
+from .abstract_owl_ontology_manager import OWLOntologyManager, OWLOntologyChange, OWLOntology
+from .abstract_owl_reasoner import OWLReasoner, OWLReasonerEx
+
+__all__ = ['OWLOntologyManager', 'OWLOntologyChange', 'OWLOntology', 'OWLReasoner', 'OWLReasonerEx']