diff --git a/ontology/caro.md b/ontology/caro.md
index 7a7b84e87..07c7d6cc8 100644
--- a/ontology/caro.md
+++ b/ontology/caro.md
@@ -14,6 +14,7 @@ contact:
 description: An upper level ontology to facilitate interoperability between existing anatomy ontologies for different species
 domain: anatomy and development
 homepage: https://github.com/obophenotype/caro/
+is_obsolete: true
 license:
   label: CC BY 4.0
   url: https://creativecommons.org/licenses/by/4.0/
@@ -22,7 +23,10 @@ products:
 - id: caro.owl
 repository: https://github.com/obophenotype/caro
 tracker: https://github.com/obophenotype/caro/issues
-activity_status: active
+activity_status: inactive
 ---
 
-The Common Anatomy Reference Ontology (CARO) is being developed to facilitate interoperability between existing anatomy ontologies for different species, and will provide a template for building new anatomy ontologies. CARO will be described in Anatomy Ontologies for Bioinformatics: Principles and Practice Albert Burger, Duncan Davidson and Richard Baldock (Editors)
+The Common Anatomy Reference Ontology (CARO) is being developed to facilitate interoperability between existing anatomy ontologies for different species, and will provide a template for building new anatomy ontologies. CARO will be described in Anatomy Ontologies for Bioinformatics: Principles and Practice Albert Burger, Duncan Davidson and Richard Baldock (Editors).
+
+**Important note**: CARO has been _obsoleted_ in favour of Uberon.
+However, not all CARO terms have been migrated to Uberon; please request any terms you were using from CARO and are missing from Uberon on the Uberon issue tracker: https://github.com/obophenotype/uberon/issues.