Update index.rst

spacetelescope · Apr 11, 2024 · 7e8f18a · 7e8f18a
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diff --git a/doc/source/index.rst b/doc/source/index.rst
@@ -52,3 +52,10 @@ Indices and tables
 * :ref:`genindex`
 * :ref:`modindex`
 * :ref:`search`
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+******************
+Citation
+******************
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+* Please cite `acstools <https://ui.adsabs.harvard.edu/abs/2020ascl.soft11024L/abstract>` if you have used it in your work. 
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