diff --git a/README.md b/README.md
index c4bc916..ff261d9 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,12 @@
 
 This study is part of a [*Sussex Junior Research Assistant*](https://realitybending.github.io/jobs/assistant/) project led by [Jing Xu](https://github.com/JingxiongXu).
 
-**Try the Experiment**
+### Try the Experiment
 
 - [**Order 1 (Questionnaires First)**](https://realitybending.github.io/PrimalsInteroception/experiment/TaskFirst.html)
 - [**Order 2 (Task First)**](https://realitybending.github.io/PrimalsInteroception/experiment/QuestionnaireFirst.html)
+
+### Additional Materials
+
+- [Preregistration](osf.io/4snct)
+- Repository version at the time of preregistration
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