remind compose file how to build

Trapier Marshall · joaofnfernandes · commit baaea2dcbd41 · 2018-05-03T16:08:48.000-07:00
Signed-off-by: Trapier Marshall &lt;trapier.marshall@docker.com&gt;
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -1,6 +1,9 @@
 version: "2"
 services:
   docs:
+    build:
+      context: .
+      dockerfile: Dockerfile
     image: docs/docstage
     ports:
      - "4000:4000"
