diff --git a/cara/apps/calculator/templates/userguide.html.j2 b/cara/apps/calculator/templates/userguide.html.j2
index d78295a6..23755a1b 100644
--- a/cara/apps/calculator/templates/userguide.html.j2
+++ b/cara/apps/calculator/templates/userguide.html.j2
@@ -8,6 +8,7 @@
 <p>This is a guide to help you use the calculator app.
 If you are using the expert version of the tool,  you should look at the expert notes.</p>
 <p>For more information on the Airborne Transmission of SARS-CoV-2, feel free to check out the HSE Seminar: <a href="https://cds.cern.ch/record/2743403">https://cds.cern.ch/record/2743403</a></p>
+<p>The methodology, mathematical equations and parameters of the model are described here: <a href="https://edms.cern.ch/ui/file/2566402/1/CARA_Deterministic_parameters_2020.pdf">https://edms.cern.ch/ui/file/2566402/1/CARA_Deterministic_parameters_2020.pdf</a></p> 
 <h2>Disclaimer</h2>
 <p>The risk assessment tool simulates the long-range airborne spread SARS-CoV-2 virus in a finite volume, assuming a homogenous mixture, and estimates the risk of COVID-19 infection therein. 
 The results DO NOT include short-range airborne exposure (where the physical distance plays a factor) nor the other known modes of SARS-CoV-2 transmission.