diff --git a/website/docs/usage/adding-languages.jade b/website/docs/usage/adding-languages.jade
index 605395c3b..e1631102a 100644
--- a/website/docs/usage/adding-languages.jade
+++ b/website/docs/usage/adding-languages.jade
@@ -245,6 +245,12 @@ p
         +cell
             |  Special value for pronoun lemmas (#[code "-PRON-"]).
 
+    +row
+        +cell #[code DET_LEMMA]
+        +cell
+            |  Special value for determiner lemmas, used in languages with
+            |  inflected determiners (#[code "-DET-"]).
+
     +row
         +cell #[code ENT_ID]
         +cell