diff --git a/ontology/uo.md b/ontology/uo.md
index 23fd91980..641aba974 100644
--- a/ontology/uo.md
+++ b/ontology/uo.md
@@ -11,8 +11,8 @@ description: Metrical units for use in conjunction with PATO
 domain: phenotype
 homepage: https://github.com/bio-ontology-research-group/unit-ontology
 license:
-  label: CC BY 3.0
-  url: http://creativecommons.org/licenses/by/3.0/
+  label: CC BY 4.0
+  url: https://creativecommons.org/licenses/by/4.0/
 preferredPrefix: UO
 products:
 - id: uo.owl
@@ -23,6 +23,19 @@ publications:
   title: 'The Units Ontology: a tool for integrating units of measurement in science'
 repository: https://github.com/bio-ontology-research-group/unit-ontology
 tracker: https://github.com/bio-ontology-research-group/unit-ontology/issues
+usages:
+- description: The Ontology for Biomedical Investigations (OBI) uses UO terms to specify the units of measurement values recorded in investigations.
+  type: ontology
+  user: http://obi-ontology.org/
+- description: The HUPO-PSI mass spectrometry controlled vocabulary (PSI-MS) uses UO terms as the units of the quantitative terms it defines for the mzML and related PSI data standards.
+  publications:
+  - id: https://www.ncbi.nlm.nih.gov/pubmed/23482073
+    title: The HUPO proteomics standards initiative- mass spectrometry controlled vocabulary
+  type: ontology
+  user: https://www.psidev.info/
+- description: STATO, the statistical methods ontology, uses UO terms to type the units of the statistical measures and parameters it defines.
+  type: ontology
+  user: http://stato-ontology.org/
 activity_status: active
 ---