diff --git a/Documentation/arm64/sme.rst b/Documentation/arm64/sme.rst
index 937147f58cc5429471ce527bb38de5dd0b226366..16d2db4c2e2e9b08c5a1005dbfd1ab9d8be7c7d0 100644
--- a/Documentation/arm64/sme.rst
+++ b/Documentation/arm64/sme.rst
@@ -331,6 +331,9 @@ The regset data starts with struct user_za_header, containing:
   been read if a PTRACE_GETREGSET of NT_ARM_ZA were executed for each thread
   when the coredump was generated.
 
+* The NT_ARM_TLS note will be extended to two registers, the second register
+  will contain TPIDR2_EL0 on systems that support SME and will be read as
+  zero with writes ignored otherwise.
 
 9.  System runtime configuration
 --------------------------------