diff --git a/neuroml/nml/helper_methods.py b/neuroml/nml/helper_methods.py
index aa477af..2dcc717 100644
--- a/neuroml/nml/helper_methods.py
+++ b/neuroml/nml/helper_methods.py
@@ -1624,7 +1624,7 @@ def add_segment_group(self, group_id, neuro_lex_id=None, notes=None):
                 notes=notes, validate=False
             )
         else:
-            self.logger.warning(f"Segment group '{seg_group.id}' already exists.")
+            self.logger.debug(f"Segment group '{seg_group.id}' already exists.")
 
         return seg_group
 
diff --git a/neuroml/nml/nml.py b/neuroml/nml/nml.py
index 33447cd..ab4ce0d 100644
--- a/neuroml/nml/nml.py
+++ b/neuroml/nml/nml.py
@@ -49182,7 +49182,7 @@ def add_segment_group(self, group_id, neuro_lex_id=None, notes=None):
                 validate=False,
             )
         else:
-            self.logger.warning(f"Segment group '{seg_group.id}' already exists.")
+            self.logger.debug(f"Segment group '{seg_group.id}' already exists.")
 
         return seg_group