diff --git a/etc/requirements_docs.txt b/etc/requirements_docs.txt
index 362d4725..400b3108 100644
--- a/etc/requirements_docs.txt
+++ b/etc/requirements_docs.txt
@@ -1,3 +1,4 @@
 Sphinx>=1.3.2
 numpydoc>=0.5.0
 sphinx-autobuild==0.6.0
+enigma-catalyst		# readthedocs.org