diff --git a/src/utils/booking.rs b/src/utils/booking.rs
index a587b1f..1fbddae 100644
--- a/src/utils/booking.rs
+++ b/src/utils/booking.rs
@@ -32,7 +32,7 @@ impl Booking {
             self.runtime_accumulator += self
                 .currently_running_since
                 .take()
-                .unwrap()
+                .unwrap() //SAFETY: guaranteed by .is_running()
                 .elapsed();
         }