diff --git a/drools-core/src/main/java/org/drools/core/common/ObjectTypeConfigurationRegistry.java b/drools-core/src/main/java/org/drools/core/common/ObjectTypeConfigurationRegistry.java
index 8bf4f451248..60e8e490fe5 100644
--- a/drools-core/src/main/java/org/drools/core/common/ObjectTypeConfigurationRegistry.java
+++ b/drools-core/src/main/java/org/drools/core/common/ObjectTypeConfigurationRegistry.java
@@ -67,6 +67,7 @@ public ObjectTypeConf getOrCreateObjectTypeConf(EntryPointId entrypoint, Object
 
     // Avoid secondary super cache invalidation by testing for abstract classes first
     // Then interfaces
+    // See: https://issues.redhat.com/browse/DROOLS-7521
     private Object getKey( Object object ) {
         if (object instanceof RuleTerminalNodeLeftTuple) {
             return ClassObjectType.Match_ObjectType.getClassType();