diff --git a/website/docs/usage/adding-languages.jade b/website/docs/usage/adding-languages.jade
index 03a1eae43..30c4486b0 100644
--- a/website/docs/usage/adding-languages.jade
+++ b/website/docs/usage/adding-languages.jade
@@ -544,7 +544,9 @@ p
 p
     |  You can now train the model using a corpus for your language annotated
     |  with #[+a("http://universaldependencies.org/") Universal Dependencies].
-    |  If your corpus uses the CONLL format, you can use the
+    |  If your corpus uses the 
+    |  #[+a("http://universaldependencies.org/docs/format.html") CoNLL-U] format, 
+    |  i.e. files with the extension #[code .conllu], you can use the
     |  #[+a("/docs/usage/cli#convert") #[code convert] command] to convert it to
     |  spaCy's #[+a("/docs/api/annotation#json-input") JSON format] for training.