diff --git a/doc/conf.py b/doc/conf.py
index 0ae3c83c7c6e..2e067f5b0333 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -51,6 +51,7 @@
     'sphinx.ext.viewcode',
     'sphinx_gallery.gen_gallery',
     'nb2plots',
+    'texext',
 ]
 
 # https://github.com/sphinx-gallery/sphinx-gallery
diff --git a/doc/requirements.txt b/doc/requirements.txt
index 992e1fe85f10..57fa3a74107d 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -8,3 +8,4 @@ sphinx_rtd_theme >= 0.2.4
 sphinx-gallery >= 0.1.12
 pillow >= 4.2.1
 nb2plots >= 0.5.2
+texext >= 0.4