diff --git a/README.md b/README.md
index 0b5c7ee..0f1953d 100644
--- a/README.md
+++ b/README.md
@@ -135,7 +135,7 @@ code style: pytest, tox, Pyramid, Django Channels, Hypothesis, attrs, SQLAlchemy
 Poetry, PyPA applications (Warehouse, Bandersnatch, Pipenv, virtualenv), pandas, Pillow,
 every Datadog Agent Integration, Home Assistant, Zulip.
 
-The following organizations use _Black_: Facebook, Dropbox, Mozilla, Quora.
+The following organizations use _Black_: Facebook, Dropbox, Mozilla, Quora, Duolingo.
 
 Are we missing anyone? Let us know.