diff --git a/src/main/java/org/rumbledb/api/Item.java b/src/main/java/org/rumbledb/api/Item.java
index 3790e1d60..5a01bc91b 100644
--- a/src/main/java/org/rumbledb/api/Item.java
+++ b/src/main/java/org/rumbledb/api/Item.java
@@ -689,7 +689,7 @@ default boolean isNaN() {
     /**
      * Returns the mutability level of the item.
      *
-     * @return int representing nestedness of the item inside transform expressions.
+     * @return an int representing nestedness of the item inside transform expressions.
      */
     default int getMutabilityLevel() {
         return 0;