diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp
index 95b6078335b..be8a54e03d1 100644
--- a/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/lib/CodeGen/PrologEpilogInserter.cpp
@@ -317,7 +317,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
 
   // Start at the beginning of the local area.
   // The Offset is the distance from the stack top in the direction
-  // of stack growth -- so it's always positive.
+  // of stack growth -- so it's always nonnegative.
   int64_t Offset = TFI.getOffsetOfLocalArea();
   if (StackGrowsDown)
     Offset = -Offset;