diff --git a/src/storage/hummock_sdk/src/key.rs b/src/storage/hummock_sdk/src/key.rs
index 88c59b2e8ab43..5fa18a1bb4d72 100644
--- a/src/storage/hummock_sdk/src/key.rs
+++ b/src/storage/hummock_sdk/src/key.rs
@@ -951,7 +951,7 @@ impl<T: AsRef<[u8]> + Ord + Eq> FullKeyTracker<T> {
     /// use bytes::Bytes;
     /// use risingwave_common::catalog::TableId;
     /// use risingwave_hummock_sdk::key::{FullKey, FullKeyTracker, TableKey};
-    /// 
+    ///
     /// let table_id = TableId { table_id: 1 };
     /// let full_key1 = FullKey::new(table_id, TableKey(Bytes::from("c")), 5);
     /// let a = FullKeyTracker::<Bytes>::new(full_key1);