diff --git a/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp b/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
index e1b79fb2dbd2..d96f3ae8142d 100644
--- a/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
+++ b/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
@@ -219,7 +219,7 @@ namespace {
 /// optimization, which scans the uses of an alloca and determines if it can
 /// rewrite it in terms of a single new alloca that can be mem2reg'd.
 class ConvertToScalarInfo {
-  /// AllocaSize - The size of the alloca being considered.
+  /// AllocaSize - The size of the alloca being considered in bytes.
   unsigned AllocaSize;
   const TargetData &TD;