diff --git a/Boolean_set_operations_2/demo/Boolean_set_operations_2/help/index.html b/Boolean_set_operations_2/demo/Boolean_set_operations_2/help/index.html
index 815de9a7718..8f530e6a2fd 100644
--- a/Boolean_set_operations_2/demo/Boolean_set_operations_2/help/index.html
+++ b/Boolean_set_operations_2/demo/Boolean_set_operations_2/help/index.html
@@ -116,7 +116,7 @@
 	  Perform a boolean operation</FONT></STRONG></P>
     Left click on one of the boolean operations button layer (Intersection,
     Union, Difference between Blue and Red, Difference between Red and Blue,
-    Symmetric Difference, Blue Complement, Red Complement).
+    Symmetric Difference, Minkowsky sum, Blue Complement, Red Complement).
     the result polygon will be filled with orange and its boundary will be
     green.