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Currently, it seems like describe-package will only show the contents of the 'commentary' section for packages that are builtin. For example (describe-package 'python) show a detailed description of the package, however (describe-package 'persp-mode) only shows the small amount of meta data present for all packages. This despite the fact that it has a "Commentary" section: link

Reading the source of package.el, this seems to be intentional: package.el link, however the GNU docs certainly suggest that the usage of the commentary section as the long description is not specific to built-in packages. Specifically, "If the file has a ‘;;; Commentary:’ section, this section is used as the long description."

Can anyone explain what's going on here?

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    Congrats, you found something to report a bug for. Use M-x report-emacs-bug and point out that whatever the assumption behind that code was, it's no longer valid as external packages can be located just fine in your Emacs session. – wasamasa May 11 '16 at 23:20
  • (describe-package 'persp-mode) displays Commentary section for me on 24.5.1, it will disappear if I install this package and then delete ~/.emacs.d/elpa/persp-mode-readme.txt manually. Melpa provides this readme file at melpa.org/packages/persp-mode-readme.txt I am using Gnu Elpa and Melpa. – xuchunyang May 12 '16 at 3:19

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