Where is text annotation saved in PDF

Hi,
I have run the latest sample code provided 1.8.4 and long press on pdf text and select "TA"(Text Annotation) option from pop up menu.
Now i enter some text in the next screen ans press save.

Im not able see the saved text on the pdf after that.
Please suggest how can i see the text on odf which i entered for text Annotation?

Hi,

after you press save button, the text note icon appears on pdf.
If you press on note icon you can see your text annot

Do i need to take license for this or this feature is available in Trial code PDFViewer1.8.4?

This feature is available in demo project.
if you want this feature into your project, you need a license:

www.androidpdf.mobi/technical-specification