diff --git a/setup.cfg b/setup.cfg
index 963ce60ca..7192ba9d4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -66,6 +66,8 @@ console_scripts =
 [options.extras_require]
 lookups =
     spacy_lookups_data==1.0.0rc0
+transformers =
+    spacy_transformers>=1.0.0a17,<1.0.0
 cuda =
     cupy>=5.0.0b4,<9.0.0
 cuda80 =