diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 0102b2f2e344afd..cc84b26075a6b61 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -1309,6 +1309,7 @@ RISC-V Support
   vector.
 
 - ``__attribute__((rvv_vector_bits(N)))`` is now supported for RVV vbool*_t types.
+- ``-mtls-dialect=desc`` is now supported to enable TLS descriptors (TLSDESC).
 
 CUDA/HIP Language Changes
 ^^^^^^^^^^^^^^^^^^^^^^^^^