diff --git a/mozilla/webtools/bugzilla/Bugzilla/Bug.pm b/mozilla/webtools/bugzilla/Bugzilla/Bug.pm
index cfc01ba7b60..d941a766e1c 100644
--- a/mozilla/webtools/bugzilla/Bugzilla/Bug.pm
+++ b/mozilla/webtools/bugzilla/Bugzilla/Bug.pm
@@ -2853,11 +2853,16 @@ sub GetComments {
              INNER JOIN profiles
                      ON profiles.userid = longdescs.who
                   WHERE longdescs.bug_id = ?';
+
     if ($start) {
-        $query .= ' AND longdescs.bug_when > ?
-                    AND longdescs.bug_when <= ?';
-        push(@args, ($start, $end));
+        $query .= ' AND longdescs.bug_when > ?';
+        push(@args, $start);
     }
+    if ($end) {
+        $query .= ' AND longdescs.bug_when <= ?';
+        push(@args, $end);
+    }
+
     $query .= " ORDER BY longdescs.bug_when $sort_order";
     my $sth = $dbh->prepare($query);
     $sth->execute(@args);
diff --git a/mozilla/webtools/bugzilla/Bugzilla/WebService/Bug.pm b/mozilla/webtools/bugzilla/Bugzilla/WebService/Bug.pm
index 10ea1f88633..9d58538f2ec 100644
--- a/mozilla/webtools/bugzilla/Bugzilla/WebService/Bug.pm
+++ b/mozilla/webtools/bugzilla/Bugzilla/WebService/Bug.pm
@@ -78,7 +78,7 @@ sub comments {
         my $bug = Bugzilla::Bug->check($bug_id);
         # We want the API to always return comments in the same order.
         my $comments = Bugzilla::Bug::GetComments(
-            $bug->id, 'oldest_to_newest');
+            $bug->id, 'oldest_to_newest', $params->{new_since});
         my @result;
         foreach my $comment (@$comments) {
             next if $comment->{isprivate} && !$user->is_insider;
@@ -439,6 +439,13 @@ C<array> An array of integer comment_ids. These comments will be
 returned individually, separate from any other comments in their
 respective bugs.
 
+=item C<new_since>
+
+C<dateTime> If specified, the method will only return comments I<newer>
+than this time. This only affects comments returned from the C<bug_ids>
+argument. You will always be returned all comments you request in the
+C<comment_ids> argument, even if they are older than this date.
+
 =back
 
 =item B<Returns>