diff --git a/rslib/src/browser_table.rs b/rslib/src/browser_table.rs
index 312a17561..c13d9c294 100644
--- a/rslib/src/browser_table.rs
+++ b/rslib/src/browser_table.rs
@@ -126,8 +126,9 @@ impl Card {
         }
     }
 
-    /// This uses card.due and card.ivl to infer the elapsed time. If 'set due
-    /// date' or an add-on has changed the due date, this won't be accurate.
+    /// If last_review_date isn't stored in the card, this uses card.due and
+    /// card.ivl to infer the elapsed time, which won't be accurate if
+    /// 'set due date' or an add-on has changed the due date.
     pub(crate) fn seconds_since_last_review(&self, timing: &SchedTimingToday) -> Option<u32> {
         if let Some(last_review_time) = self.last_review_time {
             Some(timing.now.elapsed_secs_since(last_review_time) as u32)