diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -4767,6 +4767,8 @@
 - ``f``: A 32- or 64-bit floating-point register (requires F or D extension).
 - ``r``: A 32- or 64-bit general-purpose register (depending on the platform
   ``XLEN``).
+- ``v``: A vector register. Clang uses ``vr`` for vector registers and ``vm``
+  for vector mask registers. (requires V extension).
 
 Sparc: