diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 533c79e8d2cd3c33fd90ef3071023a8913be6d96..e5fa972d4c7631171a3df2322f552ab964d74361 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -546,6 +546,7 @@ 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