diff --git a/src/backend/nc_message.rs b/src/backend/nc_message.rs
index 4f6848f..b2b7981 100644
--- a/src/backend/nc_message.rs
+++ b/src/backend/nc_message.rs
@@ -21,6 +21,7 @@ impl NCMessage {
         time.format("%H:%M").to_string()
     }
 
+    /// return message date as string with given format
     pub fn get_date_str(&self, date_format: &str) -> String {
         let date: DateTime<Local> = DateTime::from(
             DateTime::<Utc>::from_timestamp(self.0.timestamp, 0)