--- a/buildout.cfg	Sun Mar 11 11:40:48 2018 +0100
+++ b/buildout.cfg	Mon Mar 26 10:38:06 2018 +0200
@@ -93,6 +93,7 @@
 recipe = collective.recipe.sphinxbuilder
 eggs =
     ${package:eggs}
+    sphinx_rtd_theme
 source = ${buildout:directory}/src/source
 build = ${buildout:directory}/src/build