diff --git a/README.md b/README.md
index 3a9a1aa..fc859b8 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ As a result, Sonyflake has the following advantages and disadvantages:
 
 - The lifetime (174 years) is longer than that of Snowflake (69 years)
 - It can work in more distributed machines (2^16) than Snowflake (2^10)
-- It can generate 2^8 IDs per 10 msec at most in a single machine/thread (slower than Snowflake)
+- It can generate 2^8 IDs per 10 msec at most in a single machine/thread (fewer than Snowflake)
 
 However, if you want more generation rate in a single host,
 you can easily run multiple Sonyflake ID generators concurrently using goroutines.
@@ -50,16 +50,15 @@ type Settings struct {
 ```
 
 - StartTime is the time since which the Sonyflake time is defined as the elapsed time.
-  If StartTime is 0, the start time of the Sonyflake is set to "2014-09-01 00:00:00 +0000 UTC".
-  If StartTime is ahead of the current time, Sonyflake is not created.
+  If StartTime is 0, the start time of the Sonyflake instance is set to "2025-01-01 00:00:00 +0000 UTC".
+  StartTime must be before the current time.
 
-- MachineID returns the unique ID of the Sonyflake instance.
-  If MachineID returns an error, Sonyflake is not created.
-  If MachineID is nil, default MachineID is used.
-  Default MachineID returns the lower 16 bits of the private IP address.
+- MachineID returns the unique ID of a Sonyflake instance.
+  If MachineID returns an error, the instance will not be created.
+  If MachineID is nil, the default MachineID is used, which returns the lower 16 bits of the private IP address.
 
-- CheckMachineID validates the uniqueness of the machine ID.
-  If CheckMachineID returns false, Sonyflake is not created.
+- CheckMachineID validates the uniqueness of a machine ID.
+  If CheckMachineID returns false, the instance will not be created.
   If CheckMachineID is nil, no validation is done.
 
 In order to get a new unique ID, you just have to call the method NextID.
@@ -74,7 +73,7 @@ But after the Sonyflake time is over the limit, NextID returns an error.
 AWS VPC and Docker
 ------------------
 
-The [awsutil](https://github.com/sony/sonyflake/blob/master/awsutil) package provides
+The [awsutil](https://github.com/sony/sonyflake/blob/master/v2/awsutil) package provides
 the function AmazonEC2MachineID that returns the lower 16-bit private IP address of the Amazon EC2 instance.
 It also works correctly on Docker
 by retrieving [instance metadata](http://docs.aws.amazon.com/en_us/AWSEC2/latest/UserGuide/ec2-instance-metadata.html).
@@ -85,7 +84,7 @@ So if each EC2 instance has a unique private IP address in AWS VPC,
 the lower 16 bits of the address is also unique.
 In this common case, you can use AmazonEC2MachineID as Settings.MachineID.
 
-See [example](https://github.com/sony/sonyflake/blob/master/example) that runs Sonyflake on AWS Elastic Beanstalk.
+See [example](https://github.com/sony/sonyflake/blob/master/v2/example) that runs Sonyflake on AWS Elastic Beanstalk.
 
 License
 -------
diff --git a/v2/sonyflake.go b/v2/sonyflake.go
index f829403..1906c2a 100644
--- a/v2/sonyflake.go
+++ b/v2/sonyflake.go
@@ -26,16 +26,15 @@ const (
 // Settings configures Sonyflake:
 //
 // StartTime is the time since which the Sonyflake time is defined as the elapsed time.
-// If StartTime is 0, the start time of the Sonyflake is set to "2014-09-01 00:00:00 +0000 UTC".
-// If StartTime is ahead of the current time, Sonyflake is not created.
+// If StartTime is 0, the start time of the Sonyflake instance is set to "2025-01-01 00:00:00 +0000 UTC".
+// StartTime must be before the current time.
 //
-// MachineID returns the unique ID of the Sonyflake instance.
-// If MachineID returns an error, Sonyflake is not created.
-// If MachineID is nil, default MachineID is used.
-// Default MachineID returns the lower 16 bits of the private IP address.
+// MachineID returns the unique ID of a Sonyflake instance.
+// If MachineID returns an error, the instance will not be created.
+// If MachineID is nil, the default MachineID is used, which returns the lower 16 bits of the private IP address.
 //
-// CheckMachineID validates the uniqueness of the machine ID.
-// If CheckMachineID returns false, Sonyflake is not created.
+// CheckMachineID validates the uniqueness of a machine ID.
+// If CheckMachineID returns false, the instance will not be created.
 // If CheckMachineID is nil, no validation is done.
 type Settings struct {
 	StartTime      time.Time
@@ -98,8 +97,6 @@ func New(st Settings) (*Sonyflake, error) {
 	return sf, nil
 }
 
-// NextID generates a next unique ID.
-// After the Sonyflake time overflows, NextID returns an error.
 // NextID generates a next unique ID as int64.
 // After the Sonyflake time overflows, NextID returns an error.
 func (sf *Sonyflake) NextID() (int64, error) {