diff --git a/lib/Support/Atomic.cpp b/lib/Support/Atomic.cpp
index 2ef32b08ef28..ac4ff3eb5c66 100644
--- a/lib/Support/Atomic.cpp
+++ b/lib/Support/Atomic.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//  This header file implements atomic operations.
+//  This file implements atomic operations.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Support/DynamicLibrary.cpp b/lib/Support/DynamicLibrary.cpp
index 82d7c0cc6d19..d2b551e8a0a6 100644
--- a/lib/Support/DynamicLibrary.cpp
+++ b/lib/Support/DynamicLibrary.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//  This header file implements the operating system DynamicLibrary concept.
+//  This file implements the operating system DynamicLibrary concept.
 //
 // FIXME: This file leaks ExplicitSymbols and OpenedHandles!
 //
diff --git a/lib/Support/Host.cpp b/lib/Support/Host.cpp
index ce0a3b6bed77..03187e97eef7 100644
--- a/lib/Support/Host.cpp
+++ b/lib/Support/Host.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//  This header file implements the operating system Host concept.
+//  This file implements the operating system Host concept.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Support/Process.cpp b/lib/Support/Process.cpp
index 0380ed955dd5..087c459e187e 100644
--- a/lib/Support/Process.cpp
+++ b/lib/Support/Process.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//  This header file implements the operating system Process concept.
+//  This file implements the operating system Process concept.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Support/Program.cpp b/lib/Support/Program.cpp
index eb700e3a8591..b84b82b1f10b 100644
--- a/lib/Support/Program.cpp
+++ b/lib/Support/Program.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//  This header file implements the operating system Program concept.
+//  This file implements the operating system Program concept.
 //
 //===----------------------------------------------------------------------===//