diff --git a/src/utils/delta_btree_map/src/lib.rs b/src/utils/delta_btree_map/src/lib.rs
index 5629de47f1002..afb49fcda469f 100644
--- a/src/utils/delta_btree_map/src/lib.rs
+++ b/src/utils/delta_btree_map/src/lib.rs
@@ -130,7 +130,7 @@ impl<'a, K: Ord, V> DeltaBTreeMap<'a, K, V> {
 ///
 /// A cursor always points at the gap of items in the map. For example:
 ///
-/// ```
+/// ```text
 /// | Foo | Bar |
 /// ^     ^     ^
 /// 1     2     3