diff --git a/email/Makefile b/email/Makefile
index 7b2c4c1..0aebc7e 100644
--- a/email/Makefile
+++ b/email/Makefile
@@ -5,6 +5,9 @@ init:
 	go get -u github.com/golang/protobuf/proto
 	go get -u github.com/golang/protobuf/protoc-gen-go
 	go get github.com/micro/micro/v3/cmd/protoc-gen-micro
+.PHONY: api
+api:
+	protoc --openapi_out=. --proto_path=. proto/email.proto
 .PHONY: proto
 proto:
 	protoc --proto_path=. --micro_out=. --go_out=:. proto/email.proto