diff --git a/CHANGES.rst b/CHANGES.rst
index 9d2b53bb..b7c78bfb 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -61,6 +61,9 @@ Deprecations and Removals
 
 - Added `'sia1'` as servicetype for registry searches. [#583]
 
+- Adding ``session`` kwarg to allow to pass a session along when turning
+  an Interface into a service via ``Interface.to_service``. [#590]
+
 
 1.5.2 (2024-05-22)
 ==================
diff --git a/pyvo/registry/regtap.py b/pyvo/registry/regtap.py
index 1ada2226..1b096a46 100644
--- a/pyvo/registry/regtap.py
+++ b/pyvo/registry/regtap.py
@@ -806,10 +806,10 @@ def get_interface(self, *,
 
         return candidates[0]
 
-    def get_service(self, service_type = None, *,
-                    lax = False,
-                    keyword = None,
-                    session = None):
+    def get_service(self, service_type: str = None, *,
+                    lax: bool = False,
+                    keyword: str = None,
+                    session: object = None):
         """
         return an appropriate DALService subclass for this resource that
         can be used to search the resource using service_type.