diff --git a/src/schedule.rs b/src/schedule.rs
index 8a678fa..f32ec64 100644
--- a/src/schedule.rs
+++ b/src/schedule.rs
@@ -14,6 +14,7 @@ impl From<Schedule> for String {
     }
 }
 
+/// Representation of a cron expression
 #[derive(Clone, Debug, Eq)]
 pub struct Schedule {
     source: String,
@@ -342,6 +343,7 @@ impl ScheduleFields {
     }
 }
 
+/// Iterates `DateTime` occurrences of a schedule.
 pub struct ScheduleIterator<'a, Z>
 where
     Z: TimeZone,