diff --git a/src/naive/datetime/mod.rs b/src/naive/datetime/mod.rs
index 34c5e0c900..7da7820501 100644
--- a/src/naive/datetime/mod.rs
+++ b/src/naive/datetime/mod.rs
@@ -902,6 +902,8 @@ impl NaiveDateTime {
     /// let tz = FixedOffset::east_opt(5 * hour).unwrap();
     /// let dt = NaiveDate::from_ymd_opt(2015, 9, 5).unwrap().and_hms_opt(23, 56, 4).unwrap().and_local_timezone(tz).unwrap();
     /// assert_eq!(dt.timezone(), tz);
+    /// ```
+    #[must_use]
     pub fn and_local_timezone<Tz: TimeZone>(&self, tz: Tz) -> LocalResult<DateTime<Tz>> {
         tz.from_local_datetime(self)
     }
@@ -914,6 +916,8 @@ impl NaiveDateTime {
     /// use chrono::{NaiveDate, NaiveTime, Utc};
     /// let dt = NaiveDate::from_ymd_opt(2023, 1, 30).unwrap().and_hms_opt(19, 32, 33).unwrap().and_utc_timezone();
     /// assert_eq!(dt.timezone(), Utc);
+    /// ```
+    #[must_use]
     pub fn and_utc_timezone(&self) -> DateTime<Utc> {
         Utc.from_utc_datetime(self)
     }