diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index cbc8a45a709..c3290e0a123 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -1102,7 +1102,7 @@ const SCEV *ScalarEvolution::getTruncateExpr(const SCEV *Op,
     return getTruncateOrZeroExtend(SZ->getOperand(), Ty);
 
   // trunc(x1+x2+...+xN) --> trunc(x1)+trunc(x2)+...+trunc(xN) if we can
-  // eliminate all the truncates, or we replace extensions with truncates.
+  // eliminate all the truncates, or we replace other casts with truncates.
   if (const SCEVAddExpr *SA = dyn_cast<SCEVAddExpr>(Op)) {
     SmallVector<const SCEV *, 4> Operands;
     bool hasTrunc = false;