diff --git a/src/test/java/org/eolang/opeo/ast/ConstTest.java b/src/test/java/org/eolang/opeo/ast/ConstTest.java
index 0417ff03..95d8a678 100644
--- a/src/test/java/org/eolang/opeo/ast/ConstTest.java
+++ b/src/test/java/org/eolang/opeo/ast/ConstTest.java
@@ -46,6 +46,9 @@
  */
 final class ConstTest {
 
+    /**
+     * Empty array of objects.
+     */
     private static final Object[] EMPTY = {};
 
     @Test