diff --git a/Makefile.custom b/Makefile.custom
index 0cc40a6..d0aff37 100644
--- a/Makefile.custom
+++ b/Makefile.custom
@@ -143,3 +143,5 @@
 .PHONY: html
 html: $(syn)
 	synopsis -f HTML -Wf,title="'BusyBox Documentation'" -o $@ $^
+
+-include $(srctree)/Makefile.local