diff --git a/main/src/main/java/org/mobilitydata/gtfsvalidator/table/GtfsFeedInfoSchema.java b/main/src/main/java/org/mobilitydata/gtfsvalidator/table/GtfsFeedInfoSchema.java
index 08ff0732a7..08dd0feca4 100644
--- a/main/src/main/java/org/mobilitydata/gtfsvalidator/table/GtfsFeedInfoSchema.java
+++ b/main/src/main/java/org/mobilitydata/gtfsvalidator/table/GtfsFeedInfoSchema.java
@@ -40,16 +40,21 @@ public interface GtfsFeedInfoSchema extends GtfsEntity {
 
   Locale defaultLang();
 
+  @Recommended
   @EndRange(field = "feed_end_date", allowEqual = true)
   GtfsDate feedStartDate();
 
+  @Recommended
   GtfsDate feedEndDate();
 
+  @Recommended
   String feedVersion();
 
+  @Recommended
   @FieldType(FieldTypeEnum.EMAIL)
   String feedContactEmail();
 
+  @Recommended
   @FieldType(FieldTypeEnum.URL)
   String feedContactUrl();
 }