diff --git a/README.md b/README.md
index 9878bfa..6cc2ce6 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ Ubergraph paper presented at ICBO 2022: https://doi.org/10.5281/zenodo.7249759
   - Ascomycete phenotype ontology (APO)
   - Mouse Developmental Stages (MmusDV)
   - Vertebrate Breed Ontology (VBO)
+  - Units of Measurement Ontology (UO)
 - Precomputed OWL classification (class hierarchy)
 - Materialized “class relations” from existential property restrictions (in separate named graphs)
 - Blazegraph RDF triplestore; SPARQL query interface
diff --git a/ontologies.txt b/ontologies.txt
index ccc5ad9..9e95b44 100644
--- a/ontologies.txt
+++ b/ontologies.txt
@@ -40,6 +40,7 @@ http://purl.obolibrary.org/obo/uberon/bridge/cl-bridge-to-fbbt.owl
 http://purl.obolibrary.org/obo/uberon/bridge/uberon-bridge-to-caro.owl
 http://purl.obolibrary.org/obo/uberon/bridge/uberon-bridge-to-fbbt.owl
 http://purl.obolibrary.org/obo/uberon/uberon-base.owl
+http://purl.obolibrary.org/obo/uo.owl
 http://purl.obolibrary.org/obo/vbo/vbo-base.owl
 http://purl.obolibrary.org/obo/wbbt/wbbt-base.owl
 http://purl.obolibrary.org/obo/wbls/wbls-base.owl