diff --git a/docs/API.md b/docs/API.md
index 65b0bfc44..be877cd66 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -433,6 +433,13 @@ The board list endpoint supports setting an `If-Modified-Since` header to limit
 
 ### POST /boards/{boardId}/stacks - Create a new stack
 
+#### Request body
+
+| Parameter | Type    | Description                                          |
+| --------- | ------- | ---------------------------------------------------- |
+| title     | String  | The title of the new stack                           |
+| order     | Integer | Order for sorting the stacks                         |
+
 #### Request parameters
 
 | Parameter | Type    | Description                  |