diff --git a/development/scons/scons_manifest.py b/development/scons/scons_manifest.py
index 77b7a2bbf6..82b3eed63d 100644
--- a/development/scons/scons_manifest.py
+++ b/development/scons/scons_manifest.py
@@ -106,6 +106,7 @@ src_header_files = Split('''
     output_latex.h
     output_plaintext.h
     output_xhtml.h
+    OutputEnums.h
     OutputParams.h
     paper.h
     ParIterator.h
diff --git a/src/Makefile.am b/src/Makefile.am
index bc0d3682a1..989438df0d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -245,6 +245,7 @@ HEADERFILESCORE = \
 	Mover.h \
 	output_docbook.h \
 	output.h \
+	OutputEnums.h \
 	output_latex.h \
 	output_xhtml.h \
 	OutputParams.h \
diff --git a/src/OutputEnums.h b/src/OutputEnums.h
new file mode 100644
index 0000000000..3ab787b381
--- /dev/null
+++ b/src/OutputEnums.h
@@ -0,0 +1,24 @@
+// -*- C++ -*-
+/**
+ * \file src/OutputEnums.h
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
+ *
+ * \author Richard Heck
+ *
+ * Full author contact details are available in file CREDITS.
+ */
+
+#ifndef OUTPUTENUMS_H
+#define OUTPUTENUMS_H
+
+namespace lyx {
+
+enum UpdateType {
+	InternalUpdate,
+	OutputUpdate
+};
+
+}
+
+#endif // OUTPUTENUMS_H