diff --git a/src/main/java/org/fit/layout/api/AreaTreeOperator.java b/src/main/java/org/fit/layout/api/AreaTreeOperator.java
index <HASH>..<HASH> 100644
--- a/src/main/java/org/fit/layout/api/AreaTreeOperator.java
+++ b/src/main/java/org/fit/layout/api/AreaTreeOperator.java
@@ -16,6 +16,12 @@ public interface AreaTreeOperator extends Service, ParametrizedOperation
 {
     
     /**
+     * Returns the operator category that allows to group similar operators in the GUI.
+     * @return The category name
+     */
+    public String getCategory();
+    
+    /**
      * Applies the operation to the given tree.
      * @param atree the area tree to be modified.
      */
Add a category to each visual area tree operator

In order to provide categorization in the GUI