diff --git a/include/llvm/Instruction.def b/include/llvm/Instruction.def
index 08806b46bdd..48a458ceb88 100644
--- a/include/llvm/Instruction.def
+++ b/include/llvm/Instruction.def
@@ -128,13 +128,13 @@ HANDLE_OTHER_INST(29, Call   , CallInst   )  // Call a function
 
 HANDLE_OTHER_INST(30, Shl    , ShiftInst  )  // Shift operations
 HANDLE_OTHER_INST(31, Shr    , ShiftInst  )
- //HANDLE_OTHER_INST(32, VANext , VANextInst )  // vanext instruction
- //HANDLE_OTHER_INST(33, VAArg  , VAArgInst  )  // vaarg  instruction
+// 32 -> Empty slot used to be used for vanext in llvm 1.5 and before.
+// 33 -> Empty slot used to be used for vaarg in llvm 1.5 and before.
 HANDLE_OTHER_INST(34, Select , SelectInst )  // select instruction
 
 HANDLE_OTHER_INST(35, UserOp1, Instruction)  // May be used internally in a pass
 HANDLE_OTHER_INST(36, UserOp2, Instruction)
-HANDLE_OTHER_INST(37, VAArg  , VAArgInst  )  // vaarg  instruction
+HANDLE_OTHER_INST(37, VAArg  , VAArgInst  )  // vaarg instruction
   LAST_OTHER_INST(37)
 
 #undef  FIRST_TERM_INST