DOC fix misleading note about sphinx version
@@ -461,9 +461,12 @@ Finally, follow the formatting rules below to make it consistently good:
.. warning:: **Sphinx version**
While we do our best to have the documentation build under as many
- version of Sphinx as possible, the different versions tend to behave
- slightly differently. To get the best results, you should use version
- 1.0.
+ version of Sphinx as possible, the different versions tend to
+ behave slightly differently. To get the best results, you should
+ use the same version as the one we used on CircleCI. Look at this
+ `github search <https://github.com/search?utf8=%E2%9C%93&q=sphinx+repo%3Ascikit-learn%2Fscikit-learn+extension%3Ash+path%3Abuild_tools%2Fcircle&type=Code>`_
+ to know the exact version.
+
.. _testing_coverage:
