diff --git a/CHANGELOG b/CHANGELOG
index 93f3d6a..761ff5d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,7 @@
 
 - v1.0.x
   - [**BREAK**] Rewritten with new API.
+  - go 1.21+ needed
   - v1.0.1: pre-released for primary structure frozen now.
 
 - v0.5.3
diff --git a/README.md b/README.md
index f8963c0..27b1f83 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,8 @@
 For full list, have a see at [CHANGELOG](CHANGELOG).
 
 - v1.0.x
+  - [**BREAK**] Rewritten with new API.
+  - go 1.21+ needed
   - v1.0.1: pre-released for primary structure frozen now.
 
 - v0.5.x
diff --git a/doc.go b/doc.go
index 3fba6ed..e707e09 100644
--- a/doc.go
+++ b/doc.go
@@ -9,7 +9,7 @@ const (
 	// AppName const
 	AppName = "socketlib"
 	// Version const
-	Version = "0.5.5"
+	Version = "1.0.1"
 	// VersionInt const
-	VersionInt = 0x000505
+	VersionInt = 0x010001
 )