diff --git a/llvm/include/llvm/CodeGen/GlobalISel/InstructionSelector.h b/llvm/include/llvm/CodeGen/GlobalISel/InstructionSelector.h
index e105379b5db9..7cf12a49758e 100644
--- a/llvm/include/llvm/CodeGen/GlobalISel/InstructionSelector.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/InstructionSelector.h
@@ -196,7 +196,8 @@ enum {
   /// Merge all memory operands into instruction.
   /// - InsnID - Instruction ID to modify
   /// - MergeInsnID... - One or more Instruction ID to merge into the result.
-  /// - -1 - Terminates the list of instructions to merge.
+  /// - GIU_MergeMemOperands_EndOfList - Terminates the list of instructions to
+  ///                                    merge.
   GIR_MergeMemOperands,
   /// Erase from parent.
   /// - InsnID - Instruction ID to erase