diff --git a/src/main.rs b/src/main.rs
index cea9933..45c2932 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -48,7 +48,7 @@ async fn ics(url: &str) -> String {
     } else if url.starts_with("https://mytimetable.tudelft.nl/ical") {
         Source::Delft
     } else {
-        return "Must be a rooster.utwente.nl URL".to_string();
+        return "Must be a rooster.utwente.nl or mytimetable.tudelft.nl URL".to_string();
     };
 
     let body = reqwest::get(url).await.unwrap().text().await.unwrap();