diff --git a/README.md b/README.md
index 70bf5a55..dac10ad3 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ This project is a work in progress. The implementation is incomplete. The docume
   * [Put](#put)
   * [PutEx](#putex)
   * [Get](#get)
+  * [Expire](#expire)
   * [Delete](#delete)
   * [LockWithTimeout](#lockwithtimeout)
   * [Unlock](#unlock)
@@ -191,6 +192,16 @@ value, err := dm.Get("my-key")
 
 It is safe to modify the contents of the returned value. It is safe to modify the contents of the argument after Get returns.
 
+### Expire
+
+Expire updates or sets the expiry for the given key. It's thread-safe.
+
+```go
+err := dm.Expire("my-key", time.Second)
+```
+
+The key has to be `string`. The second parameter is `time.Duration`.
+
 ### Delete
 
 Delete deletes the value for the given key. Delete will not return error if key doesn't exist. It's thread-safe.
diff --git a/client/client.go b/client/client.go
index de1858a3..b163b008 100644
--- a/client/client.go
+++ b/client/client.go
@@ -344,6 +344,7 @@ func (d *DMap) GetPut(key string, value interface{}) (interface{}, error) {
 	return d.processGetPutResponse(resp)
 }
 
+// Expire updates the expiry for the given key.
 func (d *DMap) Expire(key string, timeout time.Duration) error {
 	m := &protocol.Message{
 		DMap: d.name,
diff --git a/client/pipeline.go b/client/pipeline.go
index cddf6fc3..11430d3e 100644
--- a/client/pipeline.go
+++ b/client/pipeline.go
@@ -261,6 +261,7 @@ func (p *Pipeline) Flush() ([]PipelineResponse, error) {
 	return responses, resErr
 }
 
+// Expire updates the expiry for the given key.
 func (p *Pipeline) Expire(dmap, key string, timeout time.Duration) error {
 	p.m.Lock()
 	defer p.m.Unlock()
diff --git a/client/pipeline_response.go b/client/pipeline_response.go
index ffdf42f7..08567967 100644
--- a/client/pipeline_response.go
+++ b/client/pipeline_response.go
@@ -114,6 +114,7 @@ func (pr *PipelineResponse) Unlock() error {
 	return checkStatusCode(&pr.response)
 }
 
+// Expire updates the expiry for the given key.
 func (pr *PipelineResponse) Expire() error {
 	return checkStatusCode(&pr.response)
 }
diff --git a/dmap_expire.go b/dmap_expire.go
index c0d67a7f..a90f5fa9 100644
--- a/dmap_expire.go
+++ b/dmap_expire.go
@@ -16,11 +16,12 @@ package olric
 
 import (
 	"fmt"
+	"time"
+
 	"github.com/buraksezer/olric/config"
 	"github.com/buraksezer/olric/internal/discovery"
 	"github.com/buraksezer/olric/internal/protocol"
 	"github.com/buraksezer/olric/internal/storage"
-	"time"
 )
 
 func (db *Olric) localExpire(hkey uint64, dm *dmap, w *writeop) error {
@@ -157,6 +158,7 @@ func (db *Olric) exExpireOperation(req *protocol.Message) *protocol.Message {
 	return db.prepareResponse(req, db.expire(w))
 }
 
+// Expire updates the expiry for the given key.
 func (dm *DMap) Expire(key string, timeout time.Duration) error {
 	w := &writeop{
 		dmap:      dm.name,
diff --git a/internal/storage/storage.go b/internal/storage/storage.go
index 9f21a460..d4d95b1d 100644
--- a/internal/storage/storage.go
+++ b/internal/storage/storage.go
@@ -198,6 +198,7 @@ func (s *Storage) Delete(hkey uint64) error {
 	return nil
 }
 
+// UpdateTTL updates the expiry for the given key.
 func (s *Storage) UpdateTTL(hkey uint64, data *VData) error {
 	if len(s.tables) == 0 {
 		panic("tables cannot be empty")