diff --git a/README.Rmd b/README.Rmd
index 011bc0e..27975e5 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -33,10 +33,11 @@ library(blockr.extra)
 options(BLOCKR_DEV = TRUE)
 pkgload::load_all(".")
 
-stack <- new_stack(data_block, summarize_expr_block);
-serve_stack(stack)
-
-stack <- new_stack(data_block, filter_expr_block)
+stack <- new_stack(
+  data_block,
+  filter_expr_block,
+  summarize_expr_block
+);
 serve_stack(stack)
 
 # see admiral vingette for how to use admiral_dpc_block