diff -ura a/docs/index.rst b/docs/index.rst
--- a/docs/index.rst	2017-10-24 00:54:21.000000000 +0800
+++ b/docs/index.rst	2019-12-09 00:58:09.911329672 +0800
@@ -26,7 +26,7 @@
   plots (airmass, parallactic angle, sky maps).
 * Determining observability of sets of targets given an arbitrary set of
   constraints (i.e., altitude, airmass, moon separation/illumination, etc.).
-* `Astropy`_ powered!
+* `Astropy <astropy.org>`_ powered!
 
 Links
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