diff --git a/Attribute type possibilities.txt b/Attribute type possibilities.txt
index 455c001..6258985 100644
--- a/Attribute type possibilities.txt	
+++ b/Attribute type possibilities.txt	
@@ -17,7 +17,8 @@ SEEK Strain
 SEEK Sample
 SEEK Sample Multi
 Controlled Vocabulary
+Ontology
 URI
 DOI
 NCBI ID
-SEEK Data file
\ No newline at end of file
+SEEK Data file