extdir.md

@@ -4,3 +4,9 @@ To run manually:
 sudo -i -u aegir
 drush @civicrm.org extdir-scan
 ```
+
+This is usually ran from Jenkins:  
+https://test.civicrm.org/view/Sites/job/Extdir%20Scan%20(civicrm.org)/
+
+Some documentation in the dev book:  
+https://docs.civicrm.org/dev/en/latest/extensions/publish/#publishing-a-civicrm-extension
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