diff --git a/build.sh b/build.sh
index a0569ca..3dca961 100755
--- a/build.sh
+++ b/build.sh
@@ -11,9 +11,12 @@ pandoc \
 --verbose \
 --standalone \
 --self-contained \
---number-sections \
+\
 --output "${OUTPUT}/index.html" \
+\
+--number-sections \
+--slide-level '2' \
 --write 'revealjs' \
--V revealjs-url='/sw/revealjs/up' \
--V slideNumber='true' \
+--variable revealjs-url='/sw/revealjs/up' \
+--variable slideNumber \
 "${ROOT}/index.md"