diff --git a/docs/glossary.rst b/docs/glossary.rst
index 08add3a..54820e4 100644
--- a/docs/glossary.rst
+++ b/docs/glossary.rst
@@ -193,6 +193,9 @@
    TLK
       Trusted Little Kernel. A Trusted OS from NVIDIA.
 
+   TRNG
+      True Randon Number Generator (hardware based)
+
    TSP
       Test Secure Payload