From c8bb1e5096055895fd0ac08dca5fa5350f6d1fd8 Mon Sep 17 00:00:00 2001
From: Yanick Champoux <yanick@babyl.ca>
Date: Sun, 28 Aug 2022 12:54:14 -0400
Subject: [PATCH] update tutorial

---
 docs/tutorial.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/docs/tutorial.md b/docs/tutorial.md
index d766735..e1a9e3e 100644
--- a/docs/tutorial.md
+++ b/docs/tutorial.md
@@ -60,3 +60,15 @@ Once an action is defined, its creator is accessible via the `actions` accessor.
 console.log( todosDux.actions.addTodo('write tutorial') ); 
     // prints { type: 'addTodo', payload: 'write tutorial' }
 ```
+### Adding a mutation
+
+Mutations are the reducing functions associated to actions. They
+are defined via the `setMutation` method:
+
+
+    ```js
+todosDux.setMutation( 'addTodo', description => ({next_id: id, todos}) => ({
+    next_id: 1 + id,
+    todos: [...todos, { description, id, done: false }]
+}));
+```