diff --git a/source/import_documentation/Mixins/widget-mixin.rst b/source/import_documentation/Mixins/widget-mixin.rst
index 086e68e403d0dff6963dce5452a3bc7400d2712d..5df7ebde038db309200c6919441cd76e021926ec 100644
--- a/source/import_documentation/Mixins/widget-mixin.rst
+++ b/source/import_documentation/Mixins/widget-mixin.rst
@@ -215,7 +215,9 @@ Attributes
 - ``multiple-[field]-add-label`` : Text of the “+” button used to add an element  
 
 - ``multiple-[field]-remove-label`` : Text of the “x” button used to remove an element  
-    
-- ``multiple-[field]-add-class`` : Class of the “+” button used to add an element  
 
-- ``multiple-[field]-remove-class`` : Class of the “x” button used to remove an element  
+*Available from version 0.18*
+
+- ``multiple-[field]-add-class`` : Class of the “+” button used to add an element
+
+- ``multiple-[field]-remove-class`` : Class of the “x” button used to remove an element  
\ No newline at end of file