diff --git a/README.md b/README.md
index fd0c2584..e75fdbd4 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ Andre Henriques<sup>1</sup>, Marco Andreini<sup>1</sup>, Gabriella Azzopardi<sup
 <sup>5</sup>Information Technology Department, Collaboration, Devices & Applications Group, CERN<br>
 <sup>6</sup>Norwegian University of Science and Technology<br>
 
-###citation
+### citation
 A. Henriques, M. Andreini, G. Azzopardi, J. Devine, P. Elson, N. Mounet, M. Kongstein, N. Tarocco. CARA - COVID Airborne Risk Assessment tools. CERN (2021).