src/java.base/share/classes/java/util/Properties.java

@@ -1343,11 +1343,14 @@
     @Override
     public synchronized boolean remove(Object key, Object value) {
         return map.remove(key, value);
     }
 
-    /** @hidden */
+    /**
+     * @hidden
+     * @since 9
+     */
     @Override
     public synchronized boolean replace(Object key, Object oldValue, Object newValue) {
         return map.replace(key, oldValue, newValue);
     }