Documentation for JIRA 4.0. Documentation for other versions of JIRA is available too. 
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Please follow the JIRA general upgrade instructions. Additionally, please note the following:
issuecommentedited.vm e-mail template for the new Issue Comment Edited event has been added to the WEB-INF/classes/email-template-id-mappings.xml file. The id of the e-mail template used for sending Filter Subscriptions has changed to 10000. If you have manually modified the WEB-INF/classes/email-template-id-mappings.xml file in the version of JIRA you are upgrading from, please do not simply copy the old file to JIRA 3.8. You will need to port your changes to the WEB-INF/classes/email-template-id-mappings.xml file that is shipped with JIRA 3.8. If you have not changed the WEB-INF/classes/email-template-id-mappings.xml file, you do not need to worry about this.jiraaction table to support editable comments.In addition to the above, please read the Upgrade Guide for every version you are skipping during the upgrade. The complete list of Upgrade Guides is available here.