diff --git a/src/main/java/org/apache/commons/lang3/ObjectUtils.java b/src/main/java/org/apache/commons/lang3/ObjectUtils.java
index e51131973..920855ca3 100644
--- a/src/main/java/org/apache/commons/lang3/ObjectUtils.java
+++ b/src/main/java/org/apache/commons/lang3/ObjectUtils.java
@@ -1057,6 +1057,7 @@ public class ObjectUtils {
             return ((Map<?, ?>) object).isEmpty();
         }
         if (object instanceof Optional<?>) {
+            // TODO Java 11 Use Optional#isEmpty()
             return !((Optional<?>) object).isPresent();
         }
         return false;