diff --git a/Documentation/Books/Manual/DataModeling/Collections/DatabaseMethods.md b/Documentation/Books/Manual/DataModeling/Collections/DatabaseMethods.md
index 98299d7137..7b29b90ef1 100644
--- a/Documentation/Books/Manual/DataModeling/Collections/DatabaseMethods.md
+++ b/Documentation/Books/Manual/DataModeling/Collections/DatabaseMethods.md
@@ -90,6 +90,8 @@ to the [naming conventions](../NamingConventions/README.md).
   following attributes (**note**: some of them are optional):
   - *type*: specifies the type of the key generator. The currently
     available generators are *traditional* and *autoincrement*.
+    (**note**: *autoincrement* is currently only supported for non-sharded
+    collections)
   - *allowUserKeys*: if set to *true*, then it is allowed to supply
     own key values in the *_key* attribute of a document. If set to
     *false*, then the key generator will solely be responsible for