diff --git a/configure.ac b/configure.ac
index 849223c8..a152b7bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -390,6 +390,8 @@ if test "x$ASCIIDOC" = "x"; then
 fi
 AC_SUBST([ASCIIDOC])
 
+AC_ARG_VAR([ADOCFLAGS], [AsciiDoc flags])
+
 integration_tests="yes"
 AC_PATH_PROG([VALGRIND], [valgrind])
 if test "x$VALGRIND" = "x"; then
diff --git a/doc/Makefile.am b/doc/Makefile.am
index a50754d9..683dd38d 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -74,7 +74,8 @@ html_DATA = \
 ADOC_FLAGS = \
 		-f$(srcdir)/asciidoc.conf \
 		-apackage_version=$(PACKAGE_VERSION) \
-		-alocalstatedir=$(localstatedir)
+		-alocalstatedir=$(localstatedir) \
+		$(ADOCFLAGS)
 # XXX: Make asciidoc use this stylesheet
 HTML_ATTRS = --stylesheet=$(srcdir)/sysdb-man.css