diff --git a/doc/Makefile b/doc/Makefile
index 2bd0d3be..2b4c2b26 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -25,3 +25,5 @@ homepage: nav apidocs
 
 clean:
 	rm -f $(NAVFILES) $(HTMLFILES) *.pyc *.pyo
+
+.PHONY: all clean homepage nav apidocs