diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index e72c93161134..05891a029f83 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -549,6 +549,7 @@ encoded manner. The codes are the following:
     nh    no huge page advise flag
     mg    mergable advise flag
     bt    arm64 BTI guarded page
+    mt    arm64 MTE allocation tags are enabled
     ==    =======================================
 
 Note that there is no guarantee that every flag and associated mnemonic will