diff --git a/main.go b/main.go
index 4dc0a1a..bbd1d55 100644
--- a/main.go
+++ b/main.go
@@ -115,6 +115,7 @@ func _newHandlerPostAPIV1EventsSlack(cfg Config) http.HandlerFunc {
 			return
 		}
 
+		log.Printf("slack event: %s", b)
 		http.Error(w, "not impl", http.StatusNotImplemented)
 	}
 }