diff --git a/db/Makefile b/db/Makefile
index b9cdf10..68e8125 100644
--- a/db/Makefile
+++ b/db/Makefile
@@ -5,6 +5,12 @@ 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/db.proto
+
 .PHONY: proto
 proto:
 	protoc --proto_path=. --micro_out=. --go_out=:. proto/db.proto