diff --git a/l3pdffield-checkbox.dtx b/l3pdffield-checkbox.dtx
index ad026fa9..77d75504 100644
--- a/l3pdffield-checkbox.dtx
+++ b/l3pdffield-checkbox.dtx
@@ -160,7 +160,8 @@
 %  \end{syntax}
 % \emph{For experts only!}
 % This allows to give the checkbox field a specific ID. This is only useful
-% in the context of a larger fieldset or if you want to attach another annotation
+% in the context of a larger fieldset, if for example you want to use
+% the same partial name for more than one field, or if you want to attach another annotation
 % to the field with \cs{pdffield_annot:n}. If used wrongly you can
 % easily create invalid fieldset. It allows you to create to fields with the
 % same partial name, but if you want to see both