diff --git a/auth/store.go b/auth/store.go
index 84c34afde..1db89c03f 100644
--- a/auth/store.go
+++ b/auth/store.go
@@ -666,6 +666,11 @@ func (as *authStore) isOpPermitted(userName string, revision uint64, key, rangeE
 		return ErrPermissionDenied
 	}
 
+	// root role should have permission on all ranges
+	if hasRootRole(user) {
+		return nil
+	}
+
 	if as.isRangeOpPermitted(tx, userName, key, rangeEnd, permTyp) {
 		return nil
 	}
diff --git a/clientv3/example_auth_test.go b/clientv3/example_auth_test.go
index bd3a01676..f07e5095c 100644
--- a/clientv3/example_auth_test.go
+++ b/clientv3/example_auth_test.go
@@ -35,22 +35,32 @@ func ExampleAuth() {
 	if _, err = cli.RoleAdd(context.TODO(), "root"); err != nil {
 		log.Fatal(err)
 	}
-
-	if _, err = cli.RoleGrantPermission(
-		context.TODO(),
-		"root", // role name
-		"foo",  // key
-		"zoo",  // range end
-		clientv3.PermissionType(clientv3.PermReadWrite),
-	); err != nil {
-		log.Fatal(err)
-	}
 	if _, err = cli.UserAdd(context.TODO(), "root", "123"); err != nil {
 		log.Fatal(err)
 	}
 	if _, err = cli.UserGrantRole(context.TODO(), "root", "root"); err != nil {
 		log.Fatal(err)
 	}
+
+	if _, err = cli.RoleAdd(context.TODO(), "r"); err != nil {
+		log.Fatal(err)
+	}
+
+	if _, err = cli.RoleGrantPermission(
+		context.TODO(),
+		"r",   // role name
+		"foo", // key
+		"zoo", // range end
+		clientv3.PermissionType(clientv3.PermReadWrite),
+	); err != nil {
+		log.Fatal(err)
+	}
+	if _, err = cli.UserAdd(context.TODO(), "u", "123"); err != nil {
+		log.Fatal(err)
+	}
+	if _, err = cli.UserGrantRole(context.TODO(), "u", "r"); err != nil {
+		log.Fatal(err)
+	}
 	if _, err = cli.AuthEnable(context.TODO()); err != nil {
 		log.Fatal(err)
 	}
@@ -58,7 +68,7 @@ func ExampleAuth() {
 	cliAuth, err := clientv3.New(clientv3.Config{
 		Endpoints:   endpoints,
 		DialTimeout: dialTimeout,
-		Username:    "root",
+		Username:    "u",
 		Password:    "123",
 	})
 	if err != nil {
@@ -77,16 +87,27 @@ func ExampleAuth() {
 		Commit()
 	fmt.Println(err)
 
-	// now check the permission
-	resp, err := cliAuth.RoleGet(context.TODO(), "root")
+	// now check the permission with the root account
+	rootCli, err := clientv3.New(clientv3.Config{
+		Endpoints:   endpoints,
+		DialTimeout: dialTimeout,
+		Username:    "root",
+		Password:    "123",
+	})
 	if err != nil {
 		log.Fatal(err)
 	}
-	fmt.Printf("root user permission: key %q, range end %q\n", resp.Perm[0].Key, resp.Perm[0].RangeEnd)
+	defer rootCli.Close()
 
-	if _, err = cliAuth.AuthDisable(context.TODO()); err != nil {
+	resp, err := rootCli.RoleGet(context.TODO(), "r")
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("user u permission: key %q, range end %q\n", resp.Perm[0].Key, resp.Perm[0].RangeEnd)
+
+	if _, err = rootCli.AuthDisable(context.TODO()); err != nil {
 		log.Fatal(err)
 	}
 	// Output: etcdserver: permission denied
-	// root user permission: key "foo", range end "zoo"
+	// user u permission: key "foo", range end "zoo"
 }
diff --git a/e2e/ctl_v3_auth_test.go b/e2e/ctl_v3_auth_test.go
index 13f318c52..8acc9f3f0 100644
--- a/e2e/ctl_v3_auth_test.go
+++ b/e2e/ctl_v3_auth_test.go
@@ -111,11 +111,11 @@ func authCredWriteKeyTest(cx ctlCtx) {
 	cx.user, cx.pass = "root", "root"
 	authSetupTestUser(cx)
 
-	// confirm root role doesn't grant access to all keys
-	if err := ctlV3PutFailPerm(cx, "foo", "bar"); err != nil {
+	// confirm root role can access to all keys
+	if err := ctlV3Put(cx, "foo", "bar", ""); err != nil {
 		cx.t.Fatal(err)
 	}
-	if err := ctlV3GetFailPerm(cx, "foo"); err != nil {
+	if err := ctlV3Get(cx, []string{"foo"}, []kv{{"foo", "bar"}}...); err != nil {
 		cx.t.Fatal(err)
 	}
 
@@ -126,17 +126,17 @@ func authCredWriteKeyTest(cx ctlCtx) {
 	}
 	// confirm put failed
 	cx.user, cx.pass = "test-user", "pass"
-	if err := ctlV3Get(cx, []string{"foo"}, []kv{{"foo", "a"}}...); err != nil {
+	if err := ctlV3Get(cx, []string{"foo"}, []kv{{"foo", "bar"}}...); err != nil {
 		cx.t.Fatal(err)
 	}
 
 	// try good user
 	cx.user, cx.pass = "test-user", "pass"
-	if err := ctlV3Put(cx, "foo", "bar", ""); err != nil {
+	if err := ctlV3Put(cx, "foo", "bar2", ""); err != nil {
 		cx.t.Fatal(err)
 	}
 	// confirm put succeeded
-	if err := ctlV3Get(cx, []string{"foo"}, []kv{{"foo", "bar"}}...); err != nil {
+	if err := ctlV3Get(cx, []string{"foo"}, []kv{{"foo", "bar2"}}...); err != nil {
 		cx.t.Fatal(err)
 	}
 
@@ -147,7 +147,7 @@ func authCredWriteKeyTest(cx ctlCtx) {
 	}
 	// confirm put failed
 	cx.user, cx.pass = "test-user", "pass"
-	if err := ctlV3Get(cx, []string{"foo"}, []kv{{"foo", "bar"}}...); err != nil {
+	if err := ctlV3Get(cx, []string{"foo"}, []kv{{"foo", "bar2"}}...); err != nil {
 		cx.t.Fatal(err)
 	}
 }