diff --git a/src/compare/diff.rs b/src/compare/diff.rs
index 1075383f..654a1ed7 100644
--- a/src/compare/diff.rs
+++ b/src/compare/diff.rs
@@ -2119,7 +2119,18 @@ fn compare_timestamp<'b, 's>(
     let this_status = DiffStatus::Good;
     let message = None;
 
-    // TODO: Compare :type :range-type :raw-value :year-start :month-start :day-start :hour-start :minute-start :year-end :month-end :day-end :hour-end :minute-end
+    // TODO: Compare :type :range-type :raw-value :year-start :month-start :day-start :hour-start :minute-start :year-end :month-end :day-end :hour-end :minute-end :repeater-type :repeater-value :repeater-unit :warning-type :warning-value :warning-unit
+    //
+    // :type unquoted atom either diary, active, inactive, active-range, or inactive-range.
+    // :range-type unquoted atom either nil, daterange
+    // :raw-value quoted string of the source
+    // :*-start :*-end unquoted integers
+    // :repeater-type optional unquoted atom with value cumulate
+    // :repeater-value unquoted integer
+    // :repeater-unit unquoted atom with value week
+    // :warning-type optional unquoted atom with value all
+    // :warning-value unquoted integer
+    // :warning-unit unquoted atom with value day
 
     Ok(DiffResult {
         status: this_status,