diff --git a/Documentation/requirements.txt b/Documentation/requirements.txt
index 57f30be119ef..2dcdc61b3c78 100644
--- a/Documentation/requirements.txt
+++ b/Documentation/requirements.txt
@@ -8,6 +8,7 @@ imagesize==1.1.0
 Jinja2==2.10.1
 jsonschema==2.6.0
 MarkupSafe==1.0
+pyenchant==2.0.0
 Pygments==2.4.2
 pytz==2018.7
 PyYAML==4.2b1