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diff --git a/‎objectbox-java/src/main/java/io/objectbox/relation/RelationInfo.java‎
Lines changed: 10 additions & 4 deletions b/‎objectbox-java/src/main/java/io/objectbox/relation/RelationInfo.java‎
Lines changed: 10 additions & 4 deletions
diff --git a/‎objectbox-java/src/main/java/io/objectbox/relation/ToMany.java‎
Lines changed: 3 additions & 3 deletions b/‎objectbox-java/src/main/java/io/objectbox/relation/ToMany.java‎
Lines changed: 3 additions & 3 deletions
diff --git a/‎objectbox-java/src/main/java/io/objectbox/relation/ToManyGetter.java‎
Lines changed: 10 additions & 0 deletions b/‎objectbox-java/src/main/java/io/objectbox/relation/ToManyGetter.java‎
Lines changed: 10 additions & 0 deletions
@@ -23,30 +23,36 @@ public class RelationInfo<TARGET> implements Serializable {
     public final Property targetIdProperty;
 
     /** For ToMany relations based on backlinks (null otherwise). */
-    public final ToOneGetter toOneGetter;
+    public final ToOneGetter backlinkToOneGetter;
 
     /** For stand-alone to-many relations (0 otherwise). */
     public final int relationId;
 
+    /**
+     * ToOne
+     */
     public RelationInfo(EntityInfo sourceInfo, EntityInfo<TARGET> targetInfo, Property targetIdProperty) {
         this(sourceInfo, targetInfo, targetIdProperty, null);
     }
 
     public RelationInfo(EntityInfo sourceInfo, EntityInfo<TARGET> targetInfo, Property targetIdProperty,
-                        ToOneGetter toOneGetter) {
+                        ToOneGetter backlinkToOneGetter) {
         this.sourceInfo = sourceInfo;
         this.targetInfo = targetInfo;
         this.targetIdProperty = targetIdProperty;
-        this.toOneGetter = toOneGetter;
+        this.backlinkToOneGetter = backlinkToOneGetter;
         relationId = 0;
     }
 
+    /**
+     * Stand-alone to-many.
+     */
     public RelationInfo(EntityInfo sourceInfo, EntityInfo<TARGET> targetInfo, int relationId) {
         this.sourceInfo = sourceInfo;
         this.targetInfo = targetInfo;
         this.relationId = relationId;
         this.targetIdProperty = null;
-        this.toOneGetter = null;
+        this.backlinkToOneGetter = null;
     }
 }
 
@@ -479,7 +479,7 @@ public boolean internalCheckApplyToDbRequired() {
         if ((setAdded == null || setAdded.isEmpty()) && (setRemoved == null || setRemoved.isEmpty())) {
             return false;
         }
-        ToOneGetter toOneGetter = relationInfo.toOneGetter;
+        ToOneGetter backlinkToOneGetter = relationInfo.backlinkToOneGetter;
         long entityId = relationInfo.sourceInfo.getIdGetter().getId(entity);
         if (entityId == 0) {
             throw new IllegalStateException("Source entity has no ID (should have been put before)");
@@ -496,7 +496,7 @@ public boolean internalCheckApplyToDbRequired() {
                 return !setAdded.isEmpty() || !setRemoved.isEmpty();
             } else {
                 for (TARGET target : setAdded.keySet()) {
-                    ToOne<Object> toOne = toOneGetter.getToOne(target);
+                    ToOne<Object> toOne = backlinkToOneGetter.getToOne(target);
                     if (toOne == null) {
                         throw new IllegalStateException("The ToOne property for " +
                                 relationInfo.targetInfo.getEntityName() + "." + relationInfo.targetIdProperty.name +
@@ -513,7 +513,7 @@ public boolean internalCheckApplyToDbRequired() {
                 setAdded.clear();
 
                 for (TARGET target : setRemoved.keySet()) {
-                    ToOne<Object> toOne = toOneGetter.getToOne(target);
+                    ToOne<Object> toOne = backlinkToOneGetter.getToOne(target);
                     long toOneTargetId = toOne.getTargetId();
                     if (toOneTargetId == entityId) {
                         toOne.setTarget(null);
 
@@ -0,0 +1,10 @@
+package io.objectbox.relation;
+
+import java.io.Serializable;
+
+import io.objectbox.annotation.apihint.Internal;
+
+@Internal
+public interface ToManyGetter<SOURCE> extends Serializable {
+    <TARGET> ToMany<TARGET> getToOne(SOURCE object);
+}