diff --git a/website/usage/_adding-languages/_language-data.jade b/website/usage/_adding-languages/_language-data.jade
index 1b0ed241a..eedf343e6 100644
--- a/website/usage/_adding-languages/_language-data.jade
+++ b/website/usage/_adding-languages/_language-data.jade
@@ -394,7 +394,7 @@ p
             num, denom = text.split('/')
             if num.isdigit() and denom.isdigit():
                 return True
-        if text in _num_words:
+        if text.lower() in _num_words:
             return True
         return False