diff --git a/manual/Makefile b/manual/Makefile
index 222a7747..90fe0e9d 100644
--- a/manual/Makefile
+++ b/manual/Makefile
@@ -1,6 +1,7 @@
-
 all: freedoom-manual.pdf
 
 freedoom-manual.pdf: manual.adoc
 	asciidoctor-pdf -a toc manual.adoc
 
+clean:
+	$(RM) freedoom-manual.pdf