Note: If you are using qextserialport-XXX.tar.gz, the qesp.qch and html files have been provided. Open the file "html/index.html" using your web browser. Or integrated the "html/qesp.qch" into your QtCreator. == How to generate help files? == Simply run following commands at toplevel directory. qmake make docs Or run the following command at this directory qdoc3 qextserialport.qdocconf Then a folder called "html" will be generated. Open the file "html/index.html" using your web browser. == How to integrated into Qt Creator or Qt Assistant? == Once the html files are generated. run following commands cd doc/html qhelpgenerator qesp.qhp A file called "qesp.qch" will be generated. For Qt Assistant: Edit ==> Preferences ==> Documentations ==> Add... For Qt Creator Tools ==> Options ==> Help ==> Documentations ==> Add...