diff --git a/Documentation/gsdoc/GNUmakefile b/Documentation/gsdoc/GNUmakefile
index e0decf3a9..101aaf81d 100644
--- a/Documentation/gsdoc/GNUmakefile
+++ b/Documentation/gsdoc/GNUmakefile
@@ -34,6 +34,7 @@ DOCUMENT_NAME = Gui
 Gui_GSDOC_FILES = Gui.gsdoc \
 	$(Gui_AUTOGSDOC_FILES) \
 	Introduction.gsdoc \
+	DefaultsSummary.gsdoc \
 	NSBundleAdditions.gsdoc \
 	NSCoderAdditions.gsdoc \
 	NSMenuItem.gsdoc \