diff --git a/lib/CodeGen/ExpandMemCmp.cpp b/lib/CodeGen/ExpandMemCmp.cpp
index a9d3c87a0b5..09c808463a4 100644
--- a/lib/CodeGen/ExpandMemCmp.cpp
+++ b/lib/CodeGen/ExpandMemCmp.cpp
@@ -7,9 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This pass tries to partially inline the fast path of well-known library
-// functions, such as using square-root instructions for cases where sqrt()
-// does not need to set errno.
+// This pass tries to expand memcmp() calls into optimally-sized loads and
+// compares for the target.
 //
 //===----------------------------------------------------------------------===//