docs: Build as book, not article.

diff --git a/docs/Makefile.am b/docs/Makefile.am
index 0e262310a19092cbc506b836e295246fee84036c..3910cbf14026d50a985334fa5be4cfffd875e204 100644 (file)
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -35,7 +35,7 @@ icinga2doc_DATA += \
        icinga2-migration.html
 
 .adoc.html:
-       $(AD_ENV) $(AD_ASCIIDOC) -a toc -a numbered -o $@ $<
+       $(AD_ENV) $(AD_ASCIIDOC) -d book -a toc -a numbered -o $@ $<
 endif AD_COND_doc
 
 icinga2.8: $(top_builddir)/icinga-app/icinga2