diff --git a/config.php.example b/config.php.example
index a0633ee..f3b7ab0 100644
--- a/config.php.example
+++ b/config.php.example
@@ -21,8 +21,13 @@ $language = 'en';
 $name = 'My product tracker';
 
 # Default loan length
+# Valid keywords are: day, days, week, weeks, month, months, year, years
 $default_loan_length = '1 day';
 
+# Quick-select buttons for loan lengths
+# Valid keywords are: day, days, week, weeks, month, months, year, years
+$loan_length_presets = ['2 days', '3 weeks', '10 months', '3 years'];
+
 # Email subject prefix
 # Will be prepended without change, so should probably end with a space
 $email_subject_prefix = "System name: ";