diff --git a/README.md b/README.md
index 4f2c12a..01e8ccd 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,18 @@ Virgo observation data on the 7th of June 2024, (500 second from GPS time:
 The [other file](sensitivities/finesse-virgo.npy) is generated using
 [this notebook](generate_from_finesse-virgo.ipynb)
 
+## Optickle comparison
+
+The file [optickle.mat] was obtained using this
+[version](https://git.ligo.org/virgo/virgoapp/simulinkNoiseBudget/-/blob/9848794f00ccb5b6c6fa74309f9019df3f2e1387/DRITF/scatterRadiationPressure.m)
+with the 59 & 60 lines of `DRITF/scatterRadiationPressure` removed and the lines
+51 & 52 updated to:
+
+```matlab
+par.P_darkFringe = 8
+par.P_laser = 25
+```
+
 ## License
 
 This project is licensed under the GNU GPL v3+.