diff --git a/llvm/include/llvm/Transforms/Scalar.h b/llvm/include/llvm/Transforms/Scalar.h
index f59b06239503..fe7eaa7af9df 100644
--- a/llvm/include/llvm/Transforms/Scalar.h
+++ b/llvm/include/llvm/Transforms/Scalar.h
@@ -427,6 +427,11 @@ createSeparateConstOffsetFromGEPPass(const TargetMachine *TM = nullptr,
 //
 BasicBlockPass *createLoadCombinePass();
 
+//===----------------------------------------------------------------------===//
+//
+// StraightLineStrengthReduce - This pass strength-reduces some certain
+// instruction patterns in straight-line code.
+//
 FunctionPass *createStraightLineStrengthReducePass();
 
 //===----------------------------------------------------------------------===//