diff --git a/README.md b/README.md
index 74a8628..cb97236 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,238 @@ All that to say, I had some fun yesterday and hacked a proto-lovechild
 of `Rematch` and `Updeep`, with a dash of [VueX][] inspiration. 
 I call it... `Updux`.
 
-## Example
+# Synopsis
+```
+import updux from 'updux';
+
+import otherUpdux from './otherUpdux';
+
+const {
+    initial,
+    reducer,
+    actions,
+    middleware,
+    createStore,
+} = updux({ 
+    initial: {},
+    subduxes: {
+        otherUpdux,
+    },
+    mutations: {
+    },
+    effects: {
+    },
+
+})
+```
+
+# Description
+
+`Updux` exports one function, `updux`, both as a named export and as
+its default export.
+
+## helpers = updux(config);
+
+`updux` is a way to minimize and simplify the boilerplate associated with the 
+creation of a `Redux` store. It takes a shorthand configuration 
+object, and generates the appropriate reducer, actions, middleware, etc. 
+In true `Redux`-like fashion, just like reducers can be composed
+of sub-reducers, upduxs can be made of sub-upduxs.
+
+### config
+
+The config object recognize following properties.
+
+#### initial
+
+The default initial state of the reducer. Can be anything your
+heart desires. 
+
+#### subduxes
+
+Object mapping slices of the state to sub-upduxs.
+
+For example, if in plain Redux you would do
+
+```
+import { combineReducers } from 'redux';
+import todosReducer from './todos';
+import statisticsReducer from './statistics';
+
+const rootReducer = combineReducers({
+    todos: todosReducer,
+    stats: statisticsReducer,
+});
+```
+
+then with Updux you'd do 
+
+```
+import { updux } from 'updux';
+import todos from './todos';
+import statistics from './statistics';
+
+const rootUpdux = updux({
+    subduxes: {
+        todos, statistics
+    }
+});
+```
+
+#### mutations
+
+Object mapping actions to the associated state mutation.
+
+For example, in `Redux` you'd do
+
+```
+function todosReducer(state=[],action) {
+
+    switch(action.type) {
+        case 'ADD':  return [ ...state, action.payload ];
+
+        case 'DONE': return state.map( todo => todo.id === action.payload 
+            ? { ...todo, done: true } : todo )
+
+        default: return state;
+    }
+}
+```
+
+With Updux:
+
+```
+const todosUpdux = updux({
+    mutations: {
+        add: todo => state => [ ...state, todo ],
+        done: done_id => u.map( u.if( ({id} => id === done_id), {done: true} ) )
+    }
+});
+```
+
+The signature of the mutations is `(payload,action) => state => newState`.  
+It is designed to play well with `Updeep`. This way, instead of doing
+
+```
+    mutation: {
+        renameTodo: newName => state => { ...state, name: newName }
+    }
+```
+
+we can do
+
+```
+    mutation: {
+        renameTodo: newName => u({ name: newName })
+    }
+```
+
+Also, the special key `*` can be used to match any 
+action not explicitly matched by other mutations.
+
+```
+const todosUpdux = updux({
+    mutations: {
+        add: todo => state => [ ...state, todo ],
+        done: done_id => u.map( u.if( ({id} => id === done_id), {done: true} ) ),
+        '*' (payload,action) => state => {
+            console.warn( "unexpected action ", action.type );
+            return state;
+        },
+    }
+});
+```
+
+#### effects
+
+Plain object defining asynchronous actions and side-effects triggered by actions.
+The effects themselves are Redux middleware, expect with the `dispatch` 
+property of the first argument augmented with all the available actions.
+
+```
+updux({
+    effects: {
+        fetch: ({dispatch}) => next => async (action) => {
+            next(action);
+
+            let result = await fetch(action.payload.url).then( result => result.json() );
+            dispatch.fetchSuccess(result);
+        }
+    }
+});
+```
+
+
+## return value
+
+`updux` returns an object with the following properties:
+
+### initial
+
+Default initial state of the reducer. If applicable, merge
+the initial states of `config` and `subduxes`, with
+`config` having precedence over `subduxes`.
+
+If nothing was given, defaults to an empty object.
+
+### reducer
+
+A Redux reducer generated using the computed initial state and
+mutations.
+
+### mutations
+
+Merge of the config and subduxes mutations. If an action trigger
+mutations in both the main updux and its subduxes, the subduxes 
+mutations will be performed first.
+
+### actions
+
+Action creators for all actions used in the mutations, effects and subdox
+of the updox config. 
+
+The action creators have the signature `(payload={},meta={}) => ({type,
+payload,meta})` (with the extra sugar that if `meta` or `payload` are not
+specified, the key is not present in the produced action).
+
+### middleware
+
+A middleware aggregating all the effects defined in the 
+updox and its subduxes. Effects of the updox itself are
+done before the subdoxes effects.
+
+### createStore
+
+Same as doing
+
+```
+import { createStore, applyMiddleware } from 'redux';
+
+const { initial, reducer, middleware, actions } = updox(...);
+
+const store = createStore( initial, reducer, applyMiddleware(middleware) );
+
+for ( let type in actions ) {
+    store.dispatch[type] = (...args) => {
+        store.dispatch(actions[type](...args))
+    };
+}
+```
+
+So that later on you can do
+
+```
+store.dispatch.addTodo(...);
+
+// still work
+store.dispatch( actions.addTodo(...) );
+```
+
+
+
+
+
+# Example
 
 #### battle.js
 
diff --git a/babel.config.js b/babel.config.js
index f037a1a..83a7a08 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -1,4 +1,5 @@
 module.exports = {
+"plugins": [["@babel/plugin-proposal-pipeline-operator", { "proposal": "minimal" }]],
   presets: [
     [
       '@babel/preset-env',
diff --git a/package.json b/package.json
index de6431b..0166e0b 100644
--- a/package.json
+++ b/package.json
@@ -11,5 +11,8 @@
     "lodash": "^4.17.15",
     "redux": "^4.0.4",
     "updeep": "^1.2.0"
+  },
+  "devDependencies": {
+    "@babel/plugin-proposal-pipeline-operator": "^7.5.0"
   }
 }
diff --git a/src/index.js b/src/index.js
index c02266f..c262377 100644
--- a/src/index.js
+++ b/src/index.js
@@ -9,12 +9,12 @@ function actionFor(type) {
   };
 }
 
-function buildInitial({initial = {}, reducers = {}}) {
+function buildInitial({initial = {}, subduxes = {}}) {
   let state = initial;
 
   if (fp.isPlainObject(initial)) {
     initial = fp.mergeAll([
-      fp.mapValues(fp.getOr({}, 'initial'), reducers),
+      fp.mapValues(fp.getOr({}, 'initial'), subduxes),
       initial,
     ]);
   }
@@ -22,8 +22,8 @@ function buildInitial({initial = {}, reducers = {}}) {
   return initial;
 }
 
-function buildActions({mutations = {}, reducers = {}}) {
-  let actions = fp.mergeAll(fp.map(fp.getOr({}, 'actions'), reducers)) || {};
+function buildActions({mutations = {}, subduxes = {}}) {
+  let actions = fp.mergeAll(fp.map(fp.getOr({}, 'actions'), subduxes)) || {};
 
   Object.keys(mutations).forEach(type => {
     if (!actions[type]) {
@@ -34,41 +34,71 @@ function buildActions({mutations = {}, reducers = {}}) {
   return actions;
 }
 
-function buildMutations({mutations = {}, reducers = {}}) {
-  let subMut = {};
+const composeMutations = (m1,m2) =>
+        (payload=null,action={}) => state => m2(payload,action)(
+            m1(payload,action)(state) );
 
-  for (let slice in reducers) {
-    for (let mutation in reducers[slice].mutations) {
-      subMut = u(
-        {
-          [mutation]: {
-            [slice]: u.constant(reducers[slice].mutations[mutation]),
-          },
-        },
-        subMut,
-      );
-    }
-  }
+function buildMutations({mutations = {}, subduxes = {}}) {
+  // we have to differentiate the subduxes with '*' than those
+  // without, as the root '*' is not the same as any sub-'*'
 
-  subMut = fp.mapValues(updates => action =>
-    u(fp.mapValues(f => f(action))(updates)),
-  )(subMut);
+    const actions = fp.uniq( Object.keys(mutations).concat(
+        ...Object.values( subduxes ).map( ({mutations}) => Object.keys(mutations) )
+    ) );
 
-  for (let name in mutations) {
-    if (subMut[name]) {
-      const pre = subMut[name];
+    // let's seed with noops
+    let mergedMutations = {};
 
-      subMut[name] = action => state =>
-        mutations[name](action)(pre(action)(state));
-    } else {
-      subMut[name] = mutations[name];
-    }
-  }
+    actions.forEach( action => {
+        mergedMutations[action] = () => state => state;
+    });
+
+
+    console.log(mergedMutations);
+
+    Object.entries( subduxes ).forEach( ([slice, {mutations,reducer}]) => {
+
+        if( mutations['*'] ) {
+            const localized = (payload=null,action={}) => u.updateIn( slice, mutations['*'](payload,action) );
+                console.log("b");
+                mergedMutations = fp.mapValues(
+                    mutation => composeMutations(
+                        (dummy,action) => u.updateIn(slice,
+                            state => reducer(state,action)
+                        ), mutation )
+                )(mergedMutations);
+            return;
+        }
+
+        Object.entries(mutations).forEach(([type,mutation]) => {
+            const localized = (payload=null,action={}) => u.updateIn( slice, mutation(payload,action) );
+
+            if( type !== '*' ) {
+                console.log("a");
+
+                mergedMutations[type] = composeMutations(
+                    localized, mergedMutations[type]
+                )
+            }
+            else {
+            }
+        })
+    });
+    console.log(mergedMutations);
+
+    Object.entries(mutations).forEach(([type,mutation]) => {
+        console.log(type,":",mutation,":",mergedMutations[type]);
+
+                mergedMutations[type] = composeMutations(
+                    mergedMutations[type], mutation
+                )
+    });
+
+    return mergedMutations;
 
-  return subMut;
 }
 
-function buildMiddleware({effects={},reducers={}},{actions}) {
+function buildMiddleware({effects={},subduxes={}},{actions}) {
     return api => {
 
         for ( let type in actions ) {
@@ -79,14 +109,12 @@ function buildMiddleware({effects={},reducers={}},{actions}) {
     return [
         ...fp.toPairs(effects).map(([type,effect])=> {
         return api => next => action => {
-            console.log(action);
-
             if( action.type !== type ) return next(action);
 
             return effect(api)(next)(action);
         };
     }),
-        ...fp.map( 'middleware', reducers )
+        ...fp.map( 'middleware', subduxes )
     ].filter(x=>x).reduceRight( (next,mw) => mw(api)(next), original_next )
     }}
 }
@@ -100,7 +128,7 @@ function updux(config) {
 
   dux.mutations = buildMutations(config);
 
-  dux.upreducer = action => state => {
+  dux.upreducer = (action={}) => state => {
     if (state === null) state = dux.initial;
 
     const a =
diff --git a/src/splat.test.js b/src/splat.test.js
new file mode 100644
index 0000000..113a235
--- /dev/null
+++ b/src/splat.test.js
@@ -0,0 +1,63 @@
+import updux from '.';
+import u from 'updeep';
+
+const tracer = chr => u({ tracer: s => (s||'') + chr });
+
+test( 'mutations, simple', () => {
+    const dux = updux({
+        mutations: {
+            foo: () => tracer('a'),
+            '*': (p,a) => { console.log(a); return tracer('b') },
+        },
+    });
+
+   const store = dux.createStore();
+
+    expect(store.getState()).toEqual({ tracer: 'b'});
+
+    store.dispatch.foo();
+
+    expect(store.getState()).toEqual({ tracer: 'ba', });
+
+    store.dispatch({ type: 'bar' });
+
+    expect(store.getState()).toEqual({ tracer: 'bab', });
+});
+
+test( 'with subduxes', () => {
+    const dux = updux({
+        mutations: {
+            foo: () => tracer('a'),
+            '*': (dummy,a) => { console.log("got XXX " ,a); return tracer('b') },
+            bar: () => ({bar}) => ({ bar, tracer: bar.tracer })
+        },
+        subduxes: {
+            bar: updux({
+                mutations: {
+                    foo: () => tracer('d'),
+                    '*': (dummy,a) => { console.log( "got a ", dummy, a ); return tracer('e') },
+                },
+            }),
+        },
+    });
+
+   const store = dux.createStore();
+
+    expect(store.getState()).toEqual({
+        tracer: 'b',
+        bar: { tracer: 'e' } });
+
+    store.dispatch.foo();
+
+    expect(store.getState()).toEqual({
+        tracer: 'ba',
+        bar: { tracer: 'ed' } });
+
+    store.dispatch({type: 'bar'});
+
+    expect(store.getState()).toEqual({
+        tracer: 'ede',
+        bar: { tracer: 'ede' } });
+
+
+});
diff --git a/src/test.js b/src/test.js
index a0c3552..32fb945 100644
--- a/src/test.js
+++ b/src/test.js
@@ -55,7 +55,7 @@ test( 'sub reducers', () => {
     });
 
     const { initial, actions, reducer } = updux({
-        reducers: {
+        subduxes: {
             foo, bar
         }
     });
@@ -99,7 +99,7 @@ test('precedence between root and sub-reducers', () => {
                 }
             }
         },
-        reducers: {
+        subduxes: {
             foo: updux({
                 initial: {
                     bar: 2,
@@ -135,26 +135,21 @@ test( 'middleware', async () => {
         mutations: {
             inc: (addition) => state => state + addition,
             doEeet: () => state => {
-                console.log("up", state);
-
                 return state + 'Z';
             },
         },
         effects: {
             doEeet: api => next => async action => {
-                console.log(api);
                 api.dispatch.inc('a');
                 next(action);
                 await timeout(1000);
                 api.dispatch.inc('c');
             }
         },
-        reducers: {
+        subduxes: {
             foo: updux({
                 effects: {
                     doEeet: (api) => next => action => {
-                        console.log("in foo",api);
-
                         api.dispatch({ type: 'inc', payload: 'b'});
                         next(action);
                     }
@@ -165,8 +160,6 @@ test( 'middleware', async () => {
 
     const store = createStore();
 
-    console.log(store);
-
     store.dispatch.doEeet();
 
     expect(store.getState()).toEqual( 'abZ' );