diff --git a/internal/server/router.go b/internal/server/router.go
index 45bae75..2d5a66d 100644
--- a/internal/server/router.go
+++ b/internal/server/router.go
@@ -55,8 +55,9 @@ func NewRouter() {
 		r.Get("/", func(w http.ResponseWriter, r *http.Request) {
 			w.Header().Set("Content-Type", "application/json")
 			json.NewEncoder(w).Encode(map[string]string{
-				"name": "trafficlunar's api",
-				"url":  "https://github.com/trafficlunar/api",
+				"name":   "trafficlunar's api",
+				"url":    "https://github.com/trafficlunar/api",
+				"commit": os.Getenv("SOURCE_COMMIT")[:7], // shorten to 7 characters
 			})
 		})
 		r.Get("/favicon.ico", func(w http.ResponseWriter, r *http.Request) {