diff --git a/etcd/README.md b/etcd/README.md
index 44dbb51a..752a0c10 100644
--- a/etcd/README.md
+++ b/etcd/README.md
@@ -51,10 +51,15 @@ store := etcd.New(Config{
 ### Config
 ```go
 type Config struct {
+    // Endpoints is a list of URLs.
     Endpoints   []string
+    // DialTimeout is the timeout for failing to establish a connection.
     DialTimeout time.Duration
+    // Username is a username for authentication.
     Username    string
+    // Password is a password for authentication.
     Password    string
+    // Context is the context for the client.
     Context     context.Context
 }
 ```
diff --git a/etcd/config.go b/etcd/config.go
index ceaa3d76..fb17673d 100644
--- a/etcd/config.go
+++ b/etcd/config.go
@@ -7,11 +7,16 @@ import (
 
 // Config defines the config for storage.
 type Config struct {
-	Endpoints   []string
+	// Endpoints is a list of URLs.
+	Endpoints []string
+	// DialTimeout is the timeout for failing to establish a connection.
 	DialTimeout time.Duration
-	Username    string
-	Password    string
-	Context     context.Context
+	// Username is a username for authentication.
+	Username string
+	// Password is a password for authentication.
+	Password string
+	// Context is the context for the client.
+	Context context.Context
 }
 
 // ConfigDefault is the default config