diff --git a/docs/threat_model/index.rst b/docs/threat_model/index.rst
index 335937e..9d84f5b 100644
--- a/docs/threat_model/index.rst
+++ b/docs/threat_model/index.rst
@@ -15,6 +15,7 @@
 
    threat_model
    threat_model_spm
+   threat_model_el3_spm
    threat_model_fvp_r
 
 --------------