diff --git a/lib/Bytecode/Reader/ReaderWrappers.cpp b/lib/Bytecode/Reader/ReaderWrappers.cpp
index 218c694f2e4..2773d36e504 100644
--- a/lib/Bytecode/Reader/ReaderWrappers.cpp
+++ b/lib/Bytecode/Reader/ReaderWrappers.cpp
@@ -1,3 +1,10 @@
+//===- ReaderWrappers.cpp - Parse bytecode from file or buffer  -----------===//
+//
+// This file implements loading and parsing a bytecode file and parsing a
+// bytecode module from a given buffer.
+//
+//===----------------------------------------------------------------------===//
+
 #include "ReaderInternals.h"
 #include "Support/StringExtras.h"
 #include "Config/fcntl.h"