diff --git a/lib/CodeGen/RegisterClassInfo.cpp b/lib/CodeGen/RegisterClassInfo.cpp
index b7424cb98f0..aa844466496 100644
--- a/lib/CodeGen/RegisterClassInfo.cpp
+++ b/lib/CodeGen/RegisterClassInfo.cpp
@@ -8,9 +8,9 @@
 //===----------------------------------------------------------------------===//
 //
 // This file implements the RegisterClassInfo class which provides dynamic
-// information about target register classes. Callee saved and preserved
-// registers depends on calling conventions and other dynamic information, so
-// some things cannot be determined statically.
+// information about target register classes. Callee-saved vs. caller-saved and
+// reserved registers depend on calling conventions and other dynamic
+// information, so some things cannot be determined statically.
 //
 //===----------------------------------------------------------------------===//