diff --git a/llvm/include/llvm/Support/CodeGen.h b/llvm/include/llvm/Support/CodeGen.h
index 15df265556339..848796ef574f8 100644
--- a/llvm/include/llvm/Support/CodeGen.h
+++ b/llvm/include/llvm/Support/CodeGen.h
@@ -82,7 +82,7 @@ namespace llvm {
   enum class CodeGenOptLevel {
     None = 0,      ///< -O0
     Less = 1,      ///< -O1
-    Default = 2,   ///< -O2, -Os
+    Default = 2,   ///< -O2, -Os, -Oz
     Aggressive = 3 ///< -O3
   };