diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 655ca4b0a66..ce5f2397d22 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -2627,7 +2627,7 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
     }
   }
 
-  // X + X --> X
+  // X + X --> X << 1
   if (I.getType()->isInteger() && I.getType() != Type::Int1Ty) {
     if (Instruction *Result = AssociativeOpt(I, AddRHS(RHS))) return Result;