diff --git a/Makefile.inc1 b/Makefile.inc1
index f5413ea..0137127 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -238,3 +238,6 @@ api-docs:
 .else
 	(make -C ${DOC_PATH}/api html)
 .endif
+
+clean-docs:
+	make -C ${DOC_PATH}/userguide clean