The javadoc for both AbstractUndoableEdit.undo contains the following:

     * ... Subclasses should override to undo the
     * operation represented by this edit. Override should begin with
     * a call to super.
    public void undo()

In the final sentence, the word "override" is used as noun, which is non-standard. A better and clearer way would be: "The overridden method should begin with a call to super."


The javadoc for redo method contains the same sentence.