For a long time pdflatex has offered the command \pdfannot for inserting arbitrary PDF annotations. However, the command is presented in a form where additional knowledge of the definition of the PDF format is indispensable. This package is an answer to the – occasional – questions in newsgroups, about how one could use the comment function of Adobe Reader. At least for the writer of LaTeX code, the package offers a convenient and user-friendly means of using \pdfannot to provide comments in PDF files. Since version v1.1, pdfcomment.sty also supports: LaTeX -> dvips -> ps2pdf, LaTeX -> dvipdfmx and XeLaTeX. Unfortunately, support of PDF annotations by PDF viewers is sparse to nonexistent. The reference viewer for the development of this package is Adobe Reader. License: LPPL Changes in v2.1: - added support for PDF reply system \pdfcomment[avatar=Joe,id=1]{comment} \pdfreply[avatar=Bob,id=2,replyto=1]{reply to comment} works for pdflatex only! - added options id,date,timezone - added support for new icon CrossHairs (Adobe Reader X) - Bugfix: problem with \pdfmarkupcomment with page break