{"action":"opened","issue":{"url":"https://api.github.com/repos/astropy/astropy/issues/3859","labels_url":"https://api.github.com/repos/astropy/astropy/issues/3859/labels{/name}","comments_url":"https://api.github.com/repos/astropy/astropy/issues/3859/comments","events_url":"https://api.github.com/repos/astropy/astropy/issues/3859/events","html_url":"https://github.com/astropy/astropy/issues/3859","id":88792560,"number":3859,"title":"Intersphinx does not link astropy.io.fits","user":{"login":"pllim","id":2090236,"avatar_url":"https://avatars.githubusercontent.com/u/2090236?v=3","gravatar_id":"","url":"https://api.github.com/users/pllim","html_url":"https://github.com/pllim","followers_url":"https://api.github.com/users/pllim/followers","following_url":"https://api.github.com/users/pllim/following{/other_user}","gists_url":"https://api.github.com/users/pllim/gists{/gist_id}","starred_url":"https://api.github.com/users/pllim/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pllim/subscriptions","organizations_url":"https://api.github.com/users/pllim/orgs","repos_url":"https://api.github.com/users/pllim/repos","events_url":"https://api.github.com/users/pllim/events{/privacy}","received_events_url":"https://api.github.com/users/pllim/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/astropy/astropy/labels/Docs","name":"Docs","color":"02d7e1"},{"url":"https://api.github.com/repos/astropy/astropy/labels/io.fits","name":"io.fits","color":"c7def8"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-06-16T17:41:21Z","updated_at":"2015-06-16T17:41:21Z","closed_at":null,"body":"I have this in my `conf.py`:\r\n```python\r\nintersphinx_mapping = {\r\n    'python': ('http://docs.python.org/', None),\r\n    'numpy': ('http://docs.scipy.org/doc/numpy/', None),\r\n    'scipy': ('http://docs.scipy.org/doc/scipy/reference/', None),\r\n    'matplotlib': ('http://matplotlib.org/', None),\r\n    'astropy': ('http://docs.astropy.org/en/stable/', None)\r\n    }\r\n```\r\nBut Sphinx does not generate any link when I do this in my docstring; i.e., I see \"astropy.io.fits\" highlighted in italics rather than have it linked to the appropriate `astropy` API doc:\r\n```python\r\ndef myfunc():\r\n    \"\"\"Blah blah `astropy.io.fits` blahblah\"\"\"\r\n    blahblah = 1.0\r\n    # blah blah blah\r\n```"}}