diff --git a/README.rst b/README.rst
index f50cbaa..0944880 100644
--- a/README.rst
+++ b/README.rst
@@ -74,6 +74,9 @@ Client session
    # If you are not using context manager, you need to close session manually
    s.close()
 
+   # Again, don't forget to await in the AsyncIO mode
+   await s.close()
+
    # Fetching documents
    documents = s.get('resource_type')
    # Or if you want only 1, then
diff --git a/src/jsonapi_client/session.py b/src/jsonapi_client/session.py
index 63e7ab3..4924b04 100644
--- a/src/jsonapi_client/session.py
+++ b/src/jsonapi_client/session.py
@@ -278,15 +278,15 @@ async def __aexit__(self, exc_type, exc_val, exc_tb):
         logger.info('Exiting session')
         if not exc_type:
             await self.commit()
-        self.close()
+        await self.close()
 
     def close(self):
         """
         Close session and invalidate resources.
         """
-        if self.enable_async:
-            self._aiohttp_session.close()
         self.invalidate()
+        if self.enable_async:
+            return self._aiohttp_session.close()
 
     def invalidate(self):
         """
diff --git a/tests/test_client.py b/tests/test_client.py
index 349d435..b96fbbc 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -490,7 +490,7 @@ def test_error_404(mocked_fetch, api_schema):
     with pytest.raises(DocumentError) as e:
         s.get('error')
 
-    assert 'Error document was fetched' in str(e)
+    assert 'Error document was fetched' in str(e.value)
 
 
 @pytest.mark.asyncio
@@ -510,8 +510,8 @@ async def test_error_404_async(mocked_fetch, api_schema):
     assert e.value.errors['status_code'] == 404
     with pytest.raises(DocumentError) as e:
         await s.get('error')
-    assert 'Error document was fetched' in str(e)
-    s.close()
+    assert 'Error document was fetched' in str(e.value)
+    await s.close()
 
 
 def test_relationships_with_context_manager(mocked_fetch, api_schema):
@@ -946,7 +946,7 @@ def test_schema_validation(mocked_fetch):
     with pytest.raises(ValidationError) as e:
         article = s.get('articles')
         #article.title.startswith('JSON API paints')
-    assert 'is not of type \'number\'' in str(e)
+    assert 'is not of type \'number\'' in str(e.value)
 
 
 def make_patch_json(ids, type_, field_name=None):