diff --git a/package.json b/package.json
index 5703d48..6f0aeb1 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
         "updeep": "^1.2.1"
     },
     "license": "MIT",
-    "main": "dist/index.js",
+    "main": "src/index.js",
     "name": "updux",
     "description": "Updeep-friendly Redux helper framework",
     "scripts": {
diff --git a/src/Updux.js b/src/Updux.js
index dd58c72..939a717 100644
--- a/src/Updux.js
+++ b/src/Updux.js
@@ -107,8 +107,8 @@ export class Updux {
      * updux if not already present (the idea being that making a typo on a string
      * is easy, but passing a wrong function very more unlikely).
      * @param {Function} mutation - Mutating function.
-    * @param {bool} terminal - If true, subduxes' mutations won't be invoked on
-    * the action.
+     * @param {bool} terminal - If true, subduxes' mutations won't be invoked on
+     * the action.
      *  @return {void}
      */
     setMutation(action, mutation, terminal = false) {
@@ -126,11 +126,11 @@ export class Updux {
             action = action.type;
         }
 
-        if (!this.#actions[action]) {
+        if (!this.#actions[action] && action !== '*') {
             throw new Error(`action '${action}' is not defined`);
         }
 
-        if( terminal ) {
+        if (terminal) {
             const originalMutation = mutation;
             mutation = (...args) => originalMutation(...args);
             mutation.terminal = true;
diff --git a/src/mutations.test.js b/src/mutations.test.js
index d1c532a..da6fb13 100644
--- a/src/mutations.test.js
+++ b/src/mutations.test.js
@@ -71,3 +71,20 @@ test('strings and generators', async () => {
 
     expect(foo.actions.d).toBeTypeOf('function');
 });
+
+test('splat mutation', () => {
+    const myDux = new Updux({
+        initial: [],
+        actions: { one: null, two: null },
+        mutations: {
+            '*': (payload) => (state) => payload ? [...state, payload] : state,
+        },
+    });
+    const store = myDux.createStore();
+    expect(store.getState()).toEqual([]);
+
+    store.dispatch.one(11);
+    store.dispatch.two(22);
+
+    expect(store.getState()).toEqual([11, 22]);
+});
diff --git a/src/upreducer.js b/src/upreducer.js
index 85ac320..8e9817f 100644
--- a/src/upreducer.js
+++ b/src/upreducer.js
@@ -4,9 +4,13 @@ import u from 'updeep';
 const localMutation = (mutations) => (action) => (state) => {
     const mutation = mutations[action.type];
 
-    if (!mutation) return state;
+    const splatMutation = mutations['*'];
 
-    return mutation(action.payload, action)(state);
+    if (mutation) state = mutation(action.payload, action)(state);
+
+    if (splatMutation) state = splatMutation(action.payload, action)(state);
+
+    return state;
 };
 
 const subMutations = (subduxes) => (action) => (state) => {
@@ -28,7 +32,7 @@ const subMutations = (subduxes) => (action) => (state) => {
 
 export function buildUpreducer(mutations, subduxes) {
     return (action) => (state) => {
-        if( ! mutations[action.type]?.terminal )
+        if (!mutations[action.type]?.terminal)
             state = subMutations(subduxes)(action)(state);
 
         return localMutation(mutations)(action)(state);