diff --git a/ontologies.txt b/ontologies.txt
index d73c024..2704293 100644
--- a/ontologies.txt
+++ b/ontologies.txt
@@ -46,3 +46,4 @@ http://purl.obolibrary.org/obo/wbls/wbls-base.owl
 http://purl.obolibrary.org/obo/wbphenotype/wbphenotype-base.owl
 http://purl.obolibrary.org/obo/zfa/zfa-base.owl
 https://w3id.org/orcidio/orcidio.owl
+https://raw.githubusercontent.com/brain-bican/mouse_brain_atlas_ontology/main/mbao-base.owl