diff --git a/edm4hep.yaml b/edm4hep.yaml
index 4ddcc2eec..84d3f4223 100644
--- a/edm4hep.yaml
+++ b/edm4hep.yaml
@@ -574,7 +574,7 @@ datatypes:
       - float                  goodnessOfPID  // overall goodness of the PID on a scale of [0;1]
       - edm4hep::CovMatrix4f   covMatrix      // covariance matrix of the reconstructed particle 4vector
     OneToOneRelations:
-      - edm4hep::Vertex          startVertex    // start vertex associated to this particle
+      - edm4hep::Vertex          decayVertex    // decay vertex for the particle (if it is a composite particle)
     OneToManyRelations:
       - edm4hep::Cluster               clusters     // clusters that have been used for this particle
       - edm4hep::Track                 tracks       // tracks that have been used for this particle