diff --git a/docs/glossary.rst b/docs/glossary.rst
index c02e938..abacc9e 100644
--- a/docs/glossary.rst
+++ b/docs/glossary.rst
@@ -136,6 +136,9 @@
    OTE
       Open-source Trusted Execution Environment
 
+   PCR
+      Platform Configuration Register
+
    PDD
       Platform Design Document