Hi Mehmet, I have never done this before but I think the solution is: 1- create a compiled help system for your tool: http://support.esri.com/en/knowledgebase/techarticles/detail/27681 2 - embed it into the properties of the script http://support.esri.com/en/knowledgebase/techarticles/detail/27690 I wish the solution was more straightforward for a simple task like this. Let me know, if you have further questions. Caglar
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