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diff --git a/clang/lib/Tooling/CustomToolInit.h b/clang/lib/Tooling/CustomToolInit.h
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+++ b/clang/lib/Tooling/CustomToolInit.h
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+//===--- CustomToolInit.h -------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file contains a hook to supply a custom tool initialization routine.
+//
+//  The mechanism can be used by IDEs or non-public code bases to integrate with
+//  their build system. Currently we support statically linking in an
+//  implementation of \c customToolInit and enabling it with
+//  -DUSE_CUSTOM_TOOL_INIT when compiling the Tooling library.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_TOOLING_CUSTOM_TOOL_INIT_H
+#define LLVM_CLANG_TOOLING_CUSTOM_TOOL_INIT_H
+
+namespace clang {
+namespace tooling {
+
+/// \brief Performs a custom initialization of a tool.
+///
+/// This function provides a hook for custom initialization of a clang tool. It
+/// receives command-line arguments and can change them if needed.
+/// If the initialization fails (say, custom command-line arguments are invalid)
+/// this function should terminate the process.
+void customToolInit(int argc, const char **argv);
+
+} // namespace tooling
+} // namespace clang
+
+#endif  // LLVM_CLANG_TOOLING_CUSTOM_TOOL_INIT_H