diff --git a/docs/src/tutorial/3-advanced.md b/docs/src/tutorial/3-advanced.md
index 1a580ece4..a1aa9adef 100644
--- a/docs/src/tutorial/3-advanced.md
+++ b/docs/src/tutorial/3-advanced.md
@@ -337,7 +337,7 @@ a way to set any of that, we need to write our own heading show rule.
 >>>   ),
 >>>   numbering: "1",
 >>> )
-#show heading: it => block[
+#show heading: it => block(width: 100%)[
   #set align(center)
   #set text(12pt, weight: "regular")
   #smallcaps(it.body)
@@ -416,7 +416,7 @@ differentiate between section and subsection headings:
 >>>
 #show heading.where(
   level: 1
-): it => block[
+): it => block(width: 100%)[
   #set align(center)
   #set text(12pt, weight: "regular")
   #smallcaps(it.body)