Make sure to not remove the 'docs' directory on 'make clean'
diff --git a/Makefile.am b/Makefile.am
index 487dc6a..a46e047 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -16,6 +16,3 @@
 	doxygen doxygen.cfg
 
 docs: doxygen.cfg docs/html
-
-clean-local:
-	rm -rf docs