diff --git a/credentials/doc.go b/credentials/doc.go
new file mode 100644
index 0000000..bfd59e3
--- /dev/null
+++ b/credentials/doc.go
@@ -0,0 +1,2 @@
+// Package credentials is an alibaba cloud official credentials provider implementation
+package credentials
diff --git a/credentials/request/doc.go b/credentials/request/doc.go
new file mode 100644
index 0000000..7ec0952
--- /dev/null
+++ b/credentials/request/doc.go
@@ -0,0 +1,3 @@
+// Package request is used for internal.
+// You should not depend on it directly, breaking changes can and will be introducted to it.
+package request
diff --git a/credentials/response/doc.go b/credentials/response/doc.go
new file mode 100644
index 0000000..2279570
--- /dev/null
+++ b/credentials/response/doc.go
@@ -0,0 +1,3 @@
+// Package request is used for internal.
+// You should not depend on it directly, breaking changes can and will be introducted to it.
+package response
diff --git a/credentials/utils/doc.go b/credentials/utils/doc.go
new file mode 100644
index 0000000..d8566ff
--- /dev/null
+++ b/credentials/utils/doc.go
@@ -0,0 +1,3 @@
+// Package request is used for internal.
+// You should not depend on it directly, breaking changes can and will be introducted to it.
+package utils
diff --git a/doc.go b/doc.go
index ce1010c..7bf8667 100644
--- a/doc.go
+++ b/doc.go
@@ -1,2 +1,2 @@
-// Package doc is created for depping ensure.
-package doc
+// Package credentials-go
+package credentials_go