diff --git a/java/google/registry/model/index/ForeignKeyIndex.java b/java/google/registry/model/index/ForeignKeyIndex.java
index 6f31e8a41..49a8f7934 100644
--- a/java/google/registry/model/index/ForeignKeyIndex.java
+++ b/java/google/registry/model/index/ForeignKeyIndex.java
@@ -33,6 +33,7 @@ import google.registry.model.contact.ContactResource;
 import google.registry.model.domain.DomainResource;
 import google.registry.model.host.HostResource;
 import java.util.Map;
+import javax.annotation.Nullable;
 import org.joda.time.DateTime;
 
 /**
@@ -128,6 +129,7 @@ public abstract class ForeignKeyIndex<E extends EppResource> extends BackupGroup
    * @param now the current logical time to use when checking for soft deletion of the foreign key
    *        index
    */
+  @Nullable
   public static <E extends EppResource> Key<E> loadAndGetKey(
       Class<E> clazz, String foreignKey, DateTime now) {
     ForeignKeyIndex<E> index = load(clazz, foreignKey, now);
@@ -140,6 +142,7 @@ public abstract class ForeignKeyIndex<E extends EppResource> extends BackupGroup
    *
    * <p>This will return null if the {@link ForeignKeyIndex} doesn't exist or has been soft deleted.
    */
+  @Nullable
   public static <E extends EppResource> ForeignKeyIndex<E> load(
       Class<E> clazz, String foreignKey, DateTime now) {
     return load(clazz, ImmutableList.of(foreignKey), now).get(foreignKey);