diff --git a/README.md b/README.md
index 9c7baf3..a501fd1 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 [![Go Reference](https://pkg.go.dev/badge/github.com/sebundefined/thebus.svg)](https://pkg.go.dev/github.com/sebundefined/thebus)
-[![Build Status](https://github.com/sebundefined/thebus/actions/workflows/ci.yml/badge.svg)](https://github.com/sebudefined/thebus/actions/workflows/release.yml)
+[![Build Status](https://github.com/sebundefined/thebus/actions/workflows/release.yml/badge.svg)](https://github.com/sebudefined/thebus/actions/workflows/release.yml)
 
 # thebus
 **thebus** is a lightweight message-oriented middleware that provides a dead-simple API for in-process pub/sub messaging.
diff --git a/api.go b/api.go
index 60bc999..4839293 100644
--- a/api.go
+++ b/api.go
@@ -4,10 +4,32 @@ import (
 	"context"
 )
 
+// Bus is the main interface of thebus.
+// It provides a publish/subscribe API for sending and receiving messages
+// on named topics. A Bus implementation is safe for concurrent use
+// by multiple goroutines.
 type Bus interface {
+	// Publish sends a message on the given topic.
+	// If there are subscribers, the message is enqueued in the topic’s buffer
+	// and delivered asynchronously. If the buffer is full, behavior depends on
+	// configuration: the call could return ErrQueueFull.
+	// Returns a PublishAck indicating whether the message was enqueued
+	// and how many subscribers were present at publish.
 	Publish(topic string, data []byte) (PublishAck, error)
+	// Subscribe registers a new subscription to the given topic.
+	// A subscription receives all messages published after it is created.
+	// Options (buffer size, drop policy, copy strategy, etc.) can be set
+	// via SubscribeOption functions.
+	// The subscription is automatically unsubscribed when the provided
+	// context is canceled.
 	Subscribe(ctx context.Context, topic string, opts ...SubscribeOption) (Subscription, error)
+	// Unsubscribe removes a subscriber by ID from a topic.
+	// It is safe to call multiple times; redundant calls are ignored.
 	Unsubscribe(topic string, subscriberID string) error
+	// Close shuts down the bus and all topics.
+	// After Close, no further publish or subscribe is allowed. Existing
+	// subscriptions are closed and workers are stopped. Close is idempotent.
 	Close() error
+	// Stats returns runtime statistics about the bus, topics, and subscribers.
 	Stats() (StatsResults, error)
 }
diff --git a/bus.go b/bus.go
index 9452496..6a4f17e 100644
--- a/bus.go
+++ b/bus.go
@@ -20,6 +20,9 @@ type bus struct {
 
 var _ Bus = (*bus)(nil)
 
+// New creates a new Bus instance with the given options.
+// It applies default values, normalizes the configuration, and starts the bus in an open state.
+// The returned Bus is ready to accept Publish and Subscribe calls.
 func New(opts ...Option) (Bus, error) {
 	cfg := BuildConfig(opts...).Normalize()
 	b := &bus{
@@ -32,6 +35,7 @@ func New(opts ...Option) (Bus, error) {
 	return b, nil
 }
 
+// Publish a message on a specific topic. It returns a PublishAck and/or an error.
 func (b *bus) Publish(topic string, data []byte) (PublishAck, error) {
 	now := time.Now().UTC()
 	if len(strings.TrimSpace(topic)) == 0 {
@@ -40,59 +44,52 @@ func (b *bus) Publish(topic string, data []byte) (PublishAck, error) {
 	if !b.open.Load() {
 		return PublishAck{}, ErrClosed
 	}
-	subscribersCount := 0
-	var state *topicState
+	var ack PublishAck
+	var errOut error
 	err := b.withReadState(topic, func(st *topicState) error {
-		if st == nil {
+		if st == nil || len(st.subs) == 0 {
+			ack = PublishAck{Topic: topic, Enqueued: false, Subscribers: 0}
 			return nil
 		}
-		subscribersCount = len(st.subs)
-		state = st
+		seq := st.seq.Add(1)
+
+		payload := data
+		if b.cfg.CopyOnPublish {
+			cp := make([]byte, len(data))
+			copy(cp, data)
+			payload = cp
+		}
+
+		mr := messageRef{
+			topic:   topic,
+			ts:      now,
+			seq:     seq,
+			payload: payload,
+		}
+
+		select {
+		case st.inQueue <- mr:
+			st.counters.Published.Add(1)
+			b.totals.Published.Add(1)
+			ack = PublishAck{
+				Topic:       topic,
+				Enqueued:    true,
+				Subscribers: len(st.subs),
+			}
+		default:
+			ack = PublishAck{
+				Topic:       topic,
+				Enqueued:    false,
+				Subscribers: len(st.subs),
+			}
+			errOut = ErrQueueFull
+		}
 		return nil
 	})
 	if err != nil {
 		return PublishAck{}, err
 	}
-
-	if subscribersCount == 0 {
-		return PublishAck{
-			Topic:       topic,
-			Enqueued:    false,
-			Subscribers: subscribersCount,
-		}, nil
-	}
-
-	b.mutex.RLock() // protect against close
-	cur := b.subscriptions[topic]
-	if cur != state || cur == nil {
-		b.mutex.RUnlock()
-		return PublishAck{Topic: topic, Enqueued: false, Subscribers: subscribersCount}, nil
-	}
-	seq := state.seq.Add(1)
-	mr := messageRef{
-		topic:   topic,
-		ts:      now,
-		seq:     seq,
-		payload: data,
-	}
-	select {
-	case state.inQueue <- mr:
-		b.totals.Published.Add(1)
-		state.counters.Published.Add(1)
-		b.mutex.RUnlock()
-		return PublishAck{
-			Topic:       topic,
-			Enqueued:    true,
-			Subscribers: subscribersCount,
-		}, nil
-	default:
-		b.mutex.RUnlock()
-		return PublishAck{
-			Topic:       topic,
-			Enqueued:    false,
-			Subscribers: subscribersCount,
-		}, ErrQueueFull
-	}
+	return ack, errOut
 }
 
 func (b *bus) Subscribe(ctx context.Context, topic string, opts ...SubscribeOption) (Subscription, error) {
@@ -165,8 +162,31 @@ func (b *bus) buildUnsubscribeFunction(id string, topic string) func() error {
 }
 
 func (b *bus) Unsubscribe(topic string, subscriberID string) error {
-	//TODO implement me
-	panic("implement me")
+	// Standard check
+	if !b.open.Load() {
+		return nil
+	}
+	if len(strings.TrimSpace(topic)) == 0 {
+		return ErrInvalidTopic
+	}
+	b.mutex.RLock()
+	state, ok := b.subscriptions[topic]
+	if !ok {
+		b.mutex.RUnlock()
+		return nil
+	}
+	sub, ok := state.subs[subscriberID]
+	if !ok {
+		b.mutex.RUnlock()
+		return nil
+	}
+	b.mutex.RUnlock()
+	err := sub.unsubscribeFunc()
+	if err != nil {
+		return err
+	}
+
+	return nil
 }
 
 func (b *bus) Close() error {
diff --git a/config.go b/config.go
index 3968001..bbb58f7 100644
--- a/config.go
+++ b/config.go
@@ -22,8 +22,9 @@ type Config struct {
 	TopicIdleTTL          time.Duration // if Janitor enabled (0 = off)
 	JanitorInterval       time.Duration // 0 = off
 	IDGenerator           IDGenerator   // default to DefaultIDGenerator
+	CopyOnPublish         bool          // default false
 
-	// Default for subscribers (peuvent être override par Subscribe options)
+	// Default for subscribers (Can be overridden by sub)
 	DefaultSubBufferSize int                  // default: 128
 	DefaultSendTimeout   time.Duration        // default: 200ms
 	DefaultDropIfFull    bool                 // default: true
@@ -178,6 +179,12 @@ func WithIDGenerator(IDGenerator IDGenerator) Option {
 	}
 }
 
+func WithCopyOnPublish(b bool) Option {
+	return func(cfg *Config) {
+		cfg.CopyOnPublish = b
+	}
+}
+
 func BuildConfig(opts ...Option) *Config {
 	cfg := DefaultConfig()
 	for _, opt := range opts {
diff --git a/message.go b/message.go
index 8b8e7d7..0629f05 100644
--- a/message.go
+++ b/message.go
@@ -2,6 +2,7 @@ package thebus
 
 import "time"
 
+// Message represents a message delivered to a subscriber.
 type Message struct {
 	Topic     string
 	Timestamp time.Time
diff --git a/stats.go b/stats.go
index b226e97..a79f5b9 100644
--- a/stats.go
+++ b/stats.go
@@ -5,6 +5,7 @@ import (
 	"time"
 )
 
+// Counters holds numeric counters for published, delivered, etc.
 type Counters struct {
 	Published uint64
 	Delivered uint64
@@ -12,6 +13,7 @@ type Counters struct {
 	Dropped   uint64
 }
 
+// StatsResults represents aggregated statistics of the bus.
 type StatsResults struct {
 	StartedAt   time.Time
 	Open        bool
@@ -21,6 +23,7 @@ type StatsResults struct {
 	PerTopic    map[string]TopicStats
 }
 
+// TopicStats represents statistics for a single topic.
 type TopicStats struct {
 	Subscribers int
 	Buffered    int
diff --git a/subscribe.go b/subscribe.go
index e6e192c..a5283e0 100644
--- a/subscribe.go
+++ b/subscribe.go
@@ -63,10 +63,15 @@ func (enum *SubscriptionStrategy) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+// Subscription represents a live subscription to a topic.
 type Subscription interface {
+	// GetID returns the unique ID of the subscription.
 	GetID() string
+	// GetTopic returns the topic name of the subscription.
 	GetTopic() string
+	// Read returns the channel from which messages can be consumed.
 	Read() <-chan Message
+	// Unsubscribe cancels the subscription.
 	Unsubscribe() error
 }