diff --git a/Makefile b/Makefile
index a447671..38e6fb0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,9 @@
-all: readme.html
+all : readme.html
 # Prevent make from looking for a file called 'all'
 .PHONY : all
 
-readme.html: readme.rst Makefile
+readme.html : readme.rst Makefile
 	rst2html readme.rst readme.html
+
+clean :
+	rm -f readme.html