diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.h b/llvm/lib/Target/RISCV/RISCVISelLowering.h
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.h
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.h
@@ -270,6 +270,8 @@
   VWSUB_W_VL,
   VWSUBU_W_VL,
 
+  // Narrowing logical shift right.
+  // Operands are (source, shift, passthru, mask, vl)
   VNSRL_VL,
 
   // Vector compare producing a mask. Fourth operand is input mask. Fifth