from ironpdf import *

# Load an existing PDF or create a new one
pdf = PdfDocument("existing.pdf")

pageIndex = 0

# Create a TextAnnotation object
annotation = TextAnnotation(pageIndex)
annotation.Title = "This is the major title"
annotation.Subject = "This is a subtitle"
annotation.Contents = "This is the long 'sticky note' comment content..."
annotation.Icon = TextAnnotation.AnnotationIcon.Help
annotation.X = 150
annotation.Y = 200
annotation.Width = 200
annotation.Height = 50
annotation.Opacity = 0.9
annotation.Printable = False
annotation.Hidden = False
annotation.OpenByDefault = True
annotation.ReadOnly = False
annotation.Rotatable = True

# Add the annotation to a specific page and location within the PDF
pdf.Annotations.Add(annotation)

# Save the PDF
pdf.SaveAs("existing.pdf")