diff --git a/src/main/java/org/apache/commons/pool2/impl/DefaultPooledObject.java b/src/main/java/org/apache/commons/pool2/impl/DefaultPooledObject.java
index d95fc93..a21c7a8 100644
--- a/src/main/java/org/apache/commons/pool2/impl/DefaultPooledObject.java
+++ b/src/main/java/org/apache/commons/pool2/impl/DefaultPooledObject.java
@@ -206,9 +206,11 @@
 
     /**
      * Deallocates the object and sets it {@link PooledObjectState#IDLE IDLE}
-     * if it is currently {@link PooledObjectState#ALLOCATED ALLOCATED}.
+     * if it is currently {@link PooledObjectState#ALLOCATED ALLOCATED}
+     * or {@link PooledObjectState#RETURNING RETURNING}.
      *
      * @return {@code true} if the state was {@link PooledObjectState#ALLOCATED ALLOCATED}
+     *         or {@link PooledObjectState#RETURNING RETURNING}.
      */
     @Override
     public synchronized boolean deallocate() {