diff --git a/doc/manual/src/language/index.md b/doc/manual/src/language/index.md
index 5ad235819..bc20f4316 100644
--- a/doc/manual/src/language/index.md
+++ b/doc/manual/src/language/index.md
@@ -72,6 +72,14 @@ the rest.
       Booleans
     </td>
   </tr>
+  <tr>
+    <td>
+       `null`
+    </td>
+    <td>
+      Null value
+    </td>
+  </tr>
   <tr>
     <td>
        `123`