The location keyword of OrderedDict.add is not optional.

waylan · web-flow · commit 03ebc2795601 · 2017-03-09T13:59:04.000-05:00
Fixes #554.
diff --git a/docs/extensions/api.txt b/docs/extensions/api.txt
@@ -463,7 +463,7 @@ The `add()` method accepts three arguments:
 
 * **`value`**: The object instance stored in this item.
 
-* **`location`**: Optional. The items location in relation to other items. 
+* **`location`**: The items location in relation to other items. 
 
     Note that the location can consist of a few different values:
 
