diff --git a/atrcopy/segments.py b/atrcopy/segments.py
index 4f89723..403348b 100644
--- a/atrcopy/segments.py
+++ b/atrcopy/segments.py
@@ -553,7 +553,7 @@ class DefaultSegment:
             r = r.get_indexed[other.order]
         return r
 
-    def save_session(self, mdict):
+    def serialize_session(self, mdict):
         """Save extra metadata to a dict so that it can be serialized
 
         This is not saved by __getstate__ because child segments will point to
diff --git a/test/test_serialize.py b/test/test_serialize.py
index fea334e..dc145ee 100644
--- a/test/test_serialize.py
+++ b/test/test_serialize.py
@@ -47,15 +47,15 @@ class TestSegment:
         s.set_user_data([r], 4, 99)
 
         out = dict()
-        s.serialize_extra_to_dict(out)
+        s.serialize_session(out)
         print("saved", out)
 
         data = np.ones([4000], dtype=np.uint8)
         r = SegmentData(data)
         s2 = DefaultSegment(r, 0)
-        s2.restore_extra_from_dict(out)
+        s2.restore_session(out)
         out2 = dict()
-        s2.serialize_extra_to_dict(out2)
+        s2.serialize_session(out2)
         print("loaded", out2)
         assert out == out2