diff --git a/EventOntology.ttl b/EventOntology.ttl
index aa66b39..f095959 100644
--- a/EventOntology.ttl
+++ b/EventOntology.ttl
@@ -2248,7 +2248,7 @@ cco:OscillationProcess rdf:type owl:Class ;
                        cco:definition "A Change in which the dependent entity alternates between two or more stases."@en ;
                        cco:definition_source "https://en.wikipedia.org/w/index.php?title=Oscillation&oldid=1002978272"^^xsd:anyURI ;
                        cco:is_curated_in_ontology "http://www.ontologyrepository.com/CommonCoreOntologies/Mid/EventOntology"^^xsd:anyURI ;
-                       rdfs:comment "Oscillation is often thought of in the sense of motion, e.g., a swinging clock pendulum. However, the repetitive variation in location around a central point is technically a process of vibration, sometimes refereed to as mechanical oscillation. Use the term Vibration Motion for those cases."@en ;
+                       rdfs:comment "Oscillation is often thought of in the sense of motion, e.g., a swinging clock pendulum. However, the repetitive variation in location around a central point is technically a process of vibration, sometimes referred to as mechanical oscillation. Use the term Vibration Motion for those cases."@en ;
                        rdfs:label "Oscillation Process"@en .