diff --git a/README.md b/README.md
index c8c94351..96228b9c 100644
--- a/README.md
+++ b/README.md
@@ -47,9 +47,10 @@ You could set the endpoint by:
 export GEN3_ARBORIST_ENDPOINT=${arborist_service}
 ```
 
-If not set, Guppy will skip all authorization steps as default. 
-But if you just want to mock your own authorization behavior for local test without Arborist, just set `INTERNAL_LOCAL_TEST=true`. 
-Please look into `/src/server/utils/accessibilities.js` for more details. 
+If not set, it would default to `http://arborist-service`. You could set it to `mock` to
+skip all authorization steps. But if you just want to mock your own authorization
+behavior for local test without Arborist, just set `INTERNAL_LOCAL_TEST=true`. Please
+look into `/src/server/auth/utils.js` for more details.
 
 #### Tier access
 Guppy also support 3 different levels of tier access, by setting `TIER_ACCESS_LEVEL`: 
diff --git a/src/server/config.js b/src/server/config.js
index 4ba9155a..93aaec62 100644
--- a/src/server/config.js
+++ b/src/server/config.js
@@ -29,7 +29,7 @@ const config = {
 
   port: 80,
   path: '/graphql',
-  arboristEndpoint: 'mock',
+  arboristEndpoint: 'http://arborist-service',
   tierAccessLevel: 'private',
   tierAccessLimit: 1000,
   logLevel: 'INFO',