diff --git a/doc/Makefile.am b/doc/Makefile.am
index 496b2934907670e7c4d6cfc9ff7efb041d182ed5..35cc522ca7364495efa7b26c82d7362d0316bb91 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -4,6 +4,6 @@ AUTOMAKE_OPTIONS = foreign
 
 docdir = $(datadir)/doc/$(PACKAGE)-$(VERSION)
 
-doc_DATA = *.html ao_example.c
+doc_DATA = *.html ao_example.c style.css
 
 EXTRA_DIST = $(doc_DATA)