diff --git a/README.md b/README.md
index 703a7b8..1103cbd 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,6 @@ This repository contains a few documents for covering how to create a trajectory
 2. Model Setup - Covers the nuts and bolts of setting up the model in ASTOS
 3. Results Analysis - Pictorial descriptions of getting result output as well as data extraction to Excel format
 
-For a deeper understanding of the models within ASTOS, the <a href="ASTOS%20Reference/Model_Reference.pdf">ASTOS model reference</a> is available. 
+For a deeper understanding of the models within ASTOS, the <a href="https://git.equatorial.space/ESS_Flight_Dynamics/ASTOS_Documentation/src/branch/master/ASTOS%20Reference/Model_Reference.pdf">ASTOS model reference</a> is available. 
 
 TO-DO: How to setup Monte-Carlo simulations in ASTOS
\ No newline at end of file